Implement versioncontrol reposync plugin option to store tag/commit relations optionally

A new version of the patch after changes related with default branch on git_default reposync plugin. This still needs work, but NR for testbot.

Uhm, bot is failing because it is using last release of versioncontrol instead of the dev version tarball, I added a new release on versiocontrol, but not sure how often testbot notices new releases. Let's wait a little, or if someone knows how to let bot use dev tarball please tell me :-)

let's try adding a version requirement on dependencies array at info file

There was a bug on versioncontrol about sync options, it's now fixed, and now tests are passing locally.

I also changed versioncontrol_git dependency to use versioncontrol 7.x-1.x-dev, hopefully that will make testbot choose the dev tarball, but I will wait to re-test until next rebuild of dev tarballs and until the next project dependencies rebuild, but I think the patch as it is now(comment 1 patch) will go into upstream soon.

#1: 0001-Issue-1985426-Implement-versioncontrol-reposync-plug.patch queued for re-testing.

Ok, I give up with both, it postponed the patch because a current 7.x-1.x branch here needs a patch to avoid a fatal because of signature change. I run tests locally and it worked correctly, so adding the attached patches.

Now NW for D6 version.

Since 6.x-2.x entered in maintenance mode, this will not make it there.