Don't use deprecated pkg_resources

parse_version from pkg_resources is deprecated. This commit
switches to packaging.version.Version. The use of parse_version
or packaging.version.Version is not optimal. Any version that
is not PEP440 compliant will raise an InvalidVersion exception.
Package names at SUSE are NOT PEP440 compliant, for example
"apparmor-parser-2.12.2-lp150.6.14.1". For further details
see: https://packaging.pypa.io/en/stable/version.html.

obs_img_utils/api.py

@@ -26,7 +26,7 @@
 
 from collections import namedtuple
 from distutils.dir_util import mkpath
-from pkg_resources import parse_version
+import packaging.version as pv
 from urllib.error import ContentTooShortError, URLError
 
 from obs_img_utils.exceptions import (
@@ -479,15 +479,15 @@ def _version_compare(self, current, expected, condition):
             current = 'unknown'
 
         if condition == '>=':
-            return parse_version(current) >= parse_version(expected)
+            return pv.Version(current) >= pv.Version(expected)
         elif condition == '<=':
-            return parse_version(current) <= parse_version(expected)
+            return pv.Version(current) <= pv.Version(expected)
         elif condition == '==':
-            return parse_version(current) == parse_version(expected)
+            return pv.Version(current) == pv.Version(expected)
         elif condition == '>':
-            return parse_version(current) > parse_version(expected)
+            return pv.Version(current) > pv.Version(expected)
         elif condition == '<':
-            return parse_version(current) < parse_version(expected)
+            return pv.Version(current) < pv.Version(expected)
         else:
             raise PackageVersionExceptionOBS(
                 'Invalid version compare expression: "{0}"'.format(condition)

obs_img_utils/web_content.py

@@ -27,7 +27,7 @@
     urlopen,
     Request
 )
-from pkg_resources import parse_version
+import packaging.version as pv
 
 
 class WebContent(object):
@@ -174,7 +174,7 @@ def _pick_highest_version_release(self, possible_filenames, regex):
                     chosen_tuple = (filename, extension)
                     continue
 
-                if parse_version(new_version) > parse_version(highest_version):
+                if pv.Version(new_version) > pv.Version(highest_version):
                     highest_version = new_version
                     chosen_tuple = (filename, extension)
         return chosen_tuple