Luks2 headers not recognized by sys handler, emits warning

Since the luksDump format is quite different between LUKS version 1 and 2, backupninja fails to recognize the newer format and emits a warning in the logs even though the output is valid.

   Dec 27 15:50:37 Debug: /usr/sbin/cryptsetup luksDump "/dev/ram1" | grep '^Payload offset:' | /usr/bin/awk '{print }'
   Dec 27 15:50:37 Warning: The computed size of LUKS header is not an integer, skipping /dev/ram1

The luksDump output for LUKS version 2 looks like this:

$ sudo /usr/sbin/cryptsetup luksDump "/dev/ram1"                                                                                                                               
LUKS header information                                                                                                                                                                        
Version:        2                                                                                                                                                                              
Epoch:          3                                                                                                                                                                              
Metadata area:  16384 [bytes]                                                                                                                                                                  
Keyslots area:  16744448 [bytes]                                                                                                                                                               
UUID:           50137cd5-508d-4b5f-bc59-5a9c2f548e86                                                                                                                                           
Label:          (no label)                                                                                                                                                                     
Subsystem:      (no subsystem)
Flags:          (no flags)
                            
Data segments:       
  0: crypt                     
        offset: 16777216 [bytes]
        length: (whole device)
        cipher: aes-xts-plain64                  
        sector: 512 [bytes]                                                        
                                               
Keyslots:                                                                
  0: luks2                                                                               
        Key:        512 bits                     
        Priority:   normal                                                               
        Cipher:     aes-xts-plain64            
        Cipher key: 512 bits                                                             
        PBKDF:      argon2i                                   
        Time cost:  17
        Memory:     247388
        Threads:    2
        Salt:       67 25 66 a0 ec 06 9d 90 b7 15 96 dc 1d 86 22 4d
                    35 db 93 10 c7 f8 50 63 1e 11 f9 28 2b 26 d0 a1
        AF stripes: 4000                                     
        AF hash:    sha256                                              
        Area offset:32768 [bytes]
        Area length:258048 [bytes]                                       
        Digest ID:  0                                             
Tokens:                                        
Digests:
  0: pbkdf2                                                      
        Hash:       sha256  
        Iterations: 130031                        
        Salt:       4f 87 9b ef cb 47 75 fb 60 8a 6b cf f9 64 34 e4
                    f5 56 6f d1 27 4e 4f 19 90 0a 29 e6 43 df 27 4b
        Digest:     27 be 0a 7c 9b 04 ba 31 16 42 f8 a8 f5 a6 85 e8
                    3b 27 9f 18 d2 f5 42 c5 fa 36 c3 b0 92 af 20 ba  

For comparison, this is the version 1 output:

$ sudo /usr/sbin/cryptsetup luksDump "/dev/ram1"   
LUKS header information for /dev/ram1                              
                        
Version:        1         
Cipher name:    aes              
Cipher mode:    xts-plain64       
Hash spec:      sha256
Payload offset: 4096
MK bits:        512
MK digest:      32 6e ea c7 70 b0 42 d8 e8 ed 84 f4 c1 c5 7d 02 4b 50 61 43
MK salt:        19 69 0d 51 70 63 60 45 c0 30 ce 0d d6 af 1e e9
                b2 5d 1d 6e 16 87 00 af 01 f5 50 8f 9e 45 1f bd
MK iterations:  128501                                             
UUID:           6410c635-6ebe-44ae-b9d2-27207be763d8               
                                                                   
Key Slot 0: ENABLED                                                
        Iterations:             2044006
        Salt:                   5f d7 5a be ab ba f7 c4 4b 56 ac f3 6f db e9 66
                                7b 10 96 02 04 92 a7 d7 0e 0c 3b 82 d9 55 64 09
        Key material offset:    8
        AF stripes:             4000
Key Slot 1: DISABLED
Key Slot 2: DISABLED
Key Slot 3: DISABLED
Key Slot 4: DISABLED
Key Slot 5: DISABLED
Key Slot 6: DISABLED
Key Slot 7: DISABLED