[pkg] cleaned up version after running freeze_debianver

src/leap/common/_version.py

-# This file was generated by 'versioneer.py' (0.16) from
+
+# This file was generated by the `freeze_debianver` command in setup.py
+# Using 'versioneer.py' (0.16) from
 # revision-control system data, or from the parent directory name of an
 # unpacked source archive. Distribution tarballs contain a pre-generated copy
 # of this file.
@@ -11,11 +13,9 @@ version_json = '''
  "dirty": false,
  "error": null,
  "full-revisionid": "d0aebe266b09a6787f34b16413db81a20e090601",
- "version": "0.5.1+2.gd0aebe2"
+ "version": "0.5.1"
 }
 '''  # END VERSION_JSON
 
-
 def get_versions():
     return json.loads(version_json)
-