remove unused validate-all-json.sh and validate-all-dockerfiles.

Change-Id: Ia534c200f771c23d015ab32b0cc952ca36354451
Closes-Bug: #1778146

Change-Id: Icb47ba8b13b13889e28bb285321f11344400edc2
Closes-Bug:#1582618

Unify the shell to bash in all Kolla scripts.

Change-Id: Ib9591b2f8f344eb88455c5e9b7ecf2164fb5960a
Implements: blueprint use-bash-shell

Fix incorrect test in sh. Bash implements the new test with [[ that
accepts the double equal, however, this is not a bash script. On Debian
and derivates, this will be run by dash.

Make the script portable by not using GNU extensions of xargs.

Call `validate-all-*.sh` scripts whenever possible.

Have bashate look for /usr/bin/env style shebang as well.

Remove useless validate-json.sh file.

Change-Id: Id2d697f2e9ddaa66e25f71f410200528c1e0cf6b

Change-Id: I6ee985e694142aa7dadeb085b77910667ac6359f

This patch adds a script for validating YAML files, and replaces the
existing JSON checks with one largely identical to the YAML check.

This also provides a script that can be installed as a pre-commit hook
that will perform this checks when you commit changes.  You can install
the hook by running tools/pre-commit-hook --install.

Change-Id: Ib4742a9db062362cfa61d669c691151bc1ca376c