Update gitlint configuration

Update gitlint configuration

Update pre-commit configuration for gitlint to add gitlint-ci, a hook
for CI verification, and use it during tox verification.

Create separate testenvs for installation/uninstallation/update of
pre-commit hook scripts. And also add a testenv for gitlint to run
the command with tox.

Change-Id: I3842539a7ec8d2851ff1b48c2633d964017c70cf
Signed-off-by: Sangwook Ha <sangwook.ha@verizon.com>