Stable Branch fix cmupdate on old git (CentOS 6/7) in 132.00stable

fix cmupdate on old git (CentOS 6/7) in 132.00stable

On git older than 1.8.4 (CentOS 6 git 1.7.1, CentOS 7 git 1.8.3),
`git fetch origin <branch>` only writes FETCH_HEAD, so cmupdate compared
HEAD with a stale origin/<branch> and kept saying "Already up to date".

Changes:
- inc/git_sync.inc: fetch with an explicit
+refs/heads/<branch>:refs/remotes/origin/<branch> refspec and no --prune
(on git 1.7.1, --prune deleted every other origin/* tracking ref)
- inc/git_sync.inc: _cmm_git_is_ancestor() compares git merge-base output
instead of git merge-base --is-ancestor (git 1.8.0+)
- tools/cmupdate.sh, updatecm.sh: same fetch in the fallback used when
inc/git_sync.inc is missing (it reported success on the old commit)
- tools/cmupdate-fix.sh: same fetch, and stop before git reset --hard when
git stash save -u fails on a tree with local changes (git < 1.7.7)

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132.00stable branch

• Branch: https://github.com/centminmod/centminmod/tree/132.00stable
• Commit History: https://github.com/centminmod/centminmod/commits/132.00stable