Merge branch 'lib-gitlab-git-version-popen' into 'master'

Remove Gitlab::Popen dependency from lib/gitlab/git

See merge request gitlab-org/gitlab-ce!19577

lib/gitlab/git.rb

@@ -62,7 +62,7 @@ module Gitlab
       end
 
       def version
-        Gitlab::VersionInfo.parse(Gitlab::Popen.popen(%W(#{Gitlab.config.git.bin_path} --version)).first)
+        Gitlab::Git::Version.git_version
       end
 
       def check_namespace!(*objects)

lib/gitlab/git/version.rb

+module Gitlab
+  module Git
+    module Version
+      extend Gitlab::Git::Popen
+
+      def self.git_version
+        Gitlab::VersionInfo.parse(popen(%W(#{Gitlab.config.git.bin_path} --version), nil).first)
+      end
+    end
+  end
+end