Pin git review to 1.78

Pin git review to 1.78

The latest version of module trys to look for git hook
recursively within the submodules.

Error:
    Entering 'global-jjb'
    cannot stat '.git/hooks/commit-msg': Not a directory
    fatal: run_command returned non-zero status for global-jjb

Remove workaround that has been resolved in v1.28 and use
lf-activate-venv to install git-review

Issue: RELENG-3435
Signed-off-by: Anil Belur <abelur@linuxfoundation.org>
Change-Id: I6839e2466174b3d27df21853bf960aa7c7711526
Signed-off-by: Anil Belur <abelur@linuxfoundation.org>