remove demo provider from debug builds

app/src/normalProductionFatDebug/assets/demo.bitmask.net.json

-{
-  "api_uri":"https://api.demo.bitmask.net:4430",
-  "api_version":"3",
-  "ca_cert_fingerprint":"SHA256: 40ed9d9c13872c1fcba25abdcf26a7b1bdeded433d74fbe1ccb58fbaaab58e23",
-  "ca_cert_uri":"https://api.demo.bitmask.net/ca.crt",
-  "default_language":"en",
-  "description":{
-    "en":"This is a demo provider"
-  },
-  "domain":"demo.bitmask.net",
-  "enrollment_policy":"open",
-  "languages":[
-    "en"
-  ],
-  "name":{
-    "en":"Demo provider"
-  },
-  "service":{
-    "allow_anonymous":true,
-    "allow_free":true,
-    "allow_limited_bandwidth":false,
-    "allow_paid":false,
-    "allow_registration":false,
-    "allow_unlimited_bandwidth":true,
-    "bandwidth_limit":102400,
-    "default_service_level":1,
-    "levels":{
-      "1":{
-        "description":"Please donate.",
-        "name":"free"
-      }
-    }
-  },
-  "services":[
-    "openvpn"
-  ]
-}
\ No newline at end of file

app/src/normalProductionFatDebug/assets/demo.bitmask.net.pem

------BEGIN CERTIFICATE-----
-MIIBYTCCAQigAwIBAgIBATAKBggqhkjOPQQDAjAXMRUwEwYDVQQDEwxMRUFQIFJv
-b3QgQ0EwHhcNMjQwMjIxMTEzMTUwWhcNMjkwMjIxMTEzNjUwWjAXMRUwEwYDVQQD
-EwxMRUFQIFJvb3QgQ0EwWTATBgcqhkjOPQIBBggqhkjOPQMBBwNCAARKTm8AKkqK
-aMI7dEarRRGEOPa3i49YE4bGNHxO97h14urXOROJWjnwHJdJ3dJk16oR0HKohXR7
-jSxyukoonJkgo0UwQzAOBgNVHQ8BAf8EBAMCAqQwEgYDVR0TAQH/BAgwBgEB/wIB
-ATAdBgNVHQ4EFgQUMVywfKRY9Ec3n98PVIEu7kyWKHwwCgYIKoZIzj0EAwIDRwAw
-RAIgeSMNJ51+EvNJzqsISauhOTbFxiUnnmV2z/+dxYeCPzUCIEMXM/X2ekzHEz6V
-l7zSfosiYvtQQL3ML3sLnVMmxdmd
------END CERTIFICATE-----
\ No newline at end of file

app/src/normalProductionFatDebug/assets/urls/demo.bitmask.net.url

-{
-	"main_url" : "https://demo.bitmask.net",
-	"geoip_url" : "https://menshen.demo.bitmask.net/json"
-}