Also adds gawk for timestamping.

This helps to correlate init events with failures elsewhere.

Change-Id: I22fdb683ecf9870b2d66fedd6b40b7004317130a

This is to allow CI testing of network connectivity.

Note only "primary" node gets an address on it.
Hence, "primary" becomes our fake external router.

Depends-on: https://review.opendev.org/709361

Change-Id: I05592888796107d6de95b940c42b2bff73ac0669

Separate upgrade logic to is_upgrade job var and rename
scenarios to match.

Rename "ACTION" to "SCENARIO" (as it is a scenario).

Separate testing of dashboard (aka Horizon) and increase
its timeout to 5 minutes (CentOS 7 slow as always).

Separate initialization of core OpenStack.

Use gate setup script from ./tests/

Remove useless tox setupenv.

Do not deploy Heat when not really necessary.

Change-Id: I4fca319ccc3de7188f8b7b44c9c71321e3899467