issue #603: fix monit config madness

For most services, configure `process_name` attribute of `monitoring_procmon` resource to use
new `node['nova']['platform']['nova_*_procmatch']` regular expression.

For `nova-api-os-compute`, `nova-api-ec2`, and `nova-api-metadata` on redhat,
don't monitor the same `"nova-api"` match string multiple times.