Make inspector base CI job use 2 CPUs
Make inspector base CI job use 2 CPUs

Uncompressing the ramdisk on a single core CPU can take a
substantial amount of time and elongate the overall initial
period between VM start and OS becoming operational.

Additionally, multiple CPUs allows for the software with-in
the job to execute more quickly with multiple running processes.

Change-Id: I814b12cbc05c6a110dc5593113b948e3f89e80c1

openstack/ironic-inspector,openstack/ironic-inspector