Chore: Fix bashate warnings

Chore: Fix bashate warnings

./shell/common-variables.sh:21:1: E006 Line too long
./shell/common-variables.sh:26:1: E006 Line too long
./shell/docker-build.sh:20:1: E006 Line too long
./shell/docker-login.sh:50:1: E006 Line too long
./shell/docker-push.sh:18:1: E006 Line too long
./shell/gerrit-branch-lock.sh:49:1: E006 Line too long
./shell/gerrit-branch-lock.sh:50:1: E006 Line too long
./shell/gerrit-branch-lock.sh:56:1: E006 Line too long

Issue-ID: RELENG-4358
Change-Id: I37198320bc512f2c75c47346e991ea0f0a182fab
Signed-off-by: Anil Belur <abelur@linuxfoundation.org>