remove tools/jenkins

The last non bashate change in this directory was from 2012, which
means I assume nothing down here is useful any more as this is largely
the precursor to devstack-gate.

Remove it for cleanliness reasons and to not confuse people setting
up 3rd party ci.

Change-Id: I54f06c2ff5a49a9f811df07a7cdfda4a675953c8
scope warnings to only display if the services are enabled

On my devstack environments I'm now always getting the Q_AGENT
warnings even though I don't have neutron enabled. This is mostly
confusing.

For these juno warnings lets just make sure that the whole thing
only prints out in the case where we've actually got that service
enabled.

Change-Id: I7d1bb2e65594c8bee2f572ca58a1b666e5d6caed
Merge "scope warnings to only display if the services are enabled"
Merge "remove tools/jenkins"
Merge branch 'master' of https://github.com/openstack-dev/devstack