Use git-precheck to determine if we are inside a repository

Use the more robust check implemented by the new git-precheck script,
instead of the previous dot_git() logic which checks for a ".git" folder
with fallback to git-rev-parse.  There is still more work to be done
though in refactoring this area of the git-sonar script.

Due to the specifics of this new implementation, git-sonar will no
longer attempt to operate inside a .git directory or a bare git
repository.  This makes more sense to me, since git-sonar is intended to
be an aid during active development work or branch management from
within a working tree.  This also avoids some other issues and potential
edge cases within the script that fail to run properly in those
contexts.

git-precheck exits with a code of 3 or less if it successfully
determines we are inside a valid git repository working tree, so simply
assert this in the is_repo function.

Signed-off-by: Matt Hunter <m@lfurio.us>

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