gitlab: GitLab wants git to be really on $PATH

GitLab uses git executable by full path as defined in gitlab.yml, but
not all places in code use it, e.g. here git is used just from $PATH

    https://gitlab.com/gitlab-org/gitlab_git/blob/2f0d3c1a/lib/gitlab_git/repository.rb#L259

So make sure to include our git into bundler-4gitlab PATH.

software/gitlab/software.cfg

@@ -93,10 +93,13 @@ bundle  = ${buildout:bin-directory}/bundle
 # execjs needs: nodejs
 # rails needs db client program on path: psql
 # gitlab wants to check redis version via running: redis-cli
+# gitlab wants git to be really on path ( it uses git from abspath defined in
+#   gitlab.yml, but there are not all cases like this, e.g. in
+#   https://gitlab.com/gitlab-org/gitlab_git/blob/2f0d3c1a/lib/gitlab_git/repository.rb#L259 )
 # gitlab (via github-markup) wants to convert rst -> html via running: python2 (with docutils egg)
 # (python-4gitlab puts interpreter into ${buildout:bin-directory})
 environment =
-  PATH    = ${:ruby-location}/bin:${cmake:location}/bin:${pkgconfig:location}/bin:${nodejs:location}/bin:${postgresql92:location}/bin:${redis28:location}/bin:${buildout:bin-directory}:%(PATH)s
+  PATH    = ${:ruby-location}/bin:${cmake:location}/bin:${pkgconfig:location}/bin:${nodejs:location}/bin:${postgresql92:location}/bin:${redis28:location}/bin:${git:location}/bin:${buildout:bin-directory}:%(PATH)s
 
 
 # gitlab, gitlab-shell & gitlab-workhorse checked out as git repositories