[ci skip]

This reverts commit 5daf44b7, reversing
changes made to 2f706fbd.

This reverts commit 957e849f, reversing
changes made to 6b9dbe9f.
Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Closes #2121

Add gitlab-shell to error message to give user a clue that something may be wrong there.

Ran into this in #2082. User was told that repositories were created when they were
not due to hooks symlink being wrong.

Starting with migration `20150717130904` commit count is stored in the
database. For existing projects it defaults to `0` and is updated to the
correct value when commits are pushed.

The newly introduced rake task updates the commit count for all projects
which have not been updated yet.

Refs !986, !989, #2040.

We were using hacks to drop tables etc during a Postgres backup
restore. With this change, we let pg_dump insert the DROP TABLE
statements it needs at the start of the SQL dump.

Add a task that checks repository integrity with `git fsck`.

and more readable.

This reverts commit 533f4cdf.