Fix for Issue #2470 - gem version string processing

This fix assumes that no sane gem version has spaces in it, so when one like that is encountered, it will get truncated at the first space.

library/packaging/gem

@@ -104,7 +104,7 @@ def get_installed_versions(module, remote=False):
         if match:
             versions = match.group(1)
             for version in versions.split(', '):
-                installed_versions.append(version)
+                installed_versions.append(version.split()[0])
     return installed_versions
 
 def exists(module):