The openstack eslint package is just really not needed at this
point. Use standardjs and run --fix on it.
Switch away from using node 8 to run linters and tests.
This follows removal of jobs from project-config. 
New jobs use newer node versions and new Zuul v3 format,
reusing devstack for deployment of OpenStack for functional
testing of jslib.
Version tests have been adapted to follow support logic
already in place instead of hardcoded supported versions.
Includes workaround (fixup) of devstack's bug. 
Move the functional test to experimental for now, because version
discovery doesn't work right and Firefox is generally grumpy.
We want to get the structural stuff in first.
Co-authored-by: Monty Taylor <email@example.com>