Fix formating of compute-nova measurements table

Fixes bug 1276554

Avoid nova meters being ommitted from the generated docs.

Change-Id: I4f5871fd74bdb20c0867b5ba9300eb2fa28df632
Replace 'a alarm' by 'an alarm'

This is the right article to use. It also matters because the generated
documentation in api-site currently has to be manually fixed.

Change-Id: I4a31e268b5fef47e4a6530ca5e1e4159d10c8c48
Merge "Replace 'a alarm' by 'an alarm'"
Merge "Fix formating of compute-nova measurements table"
service: re-enable eventlet just for sockets

This reenables eventlet monkey patching, but just for socket, as that
should be enough to get oslo.rpc unblocked and have the event loop
running.

Change-Id: I5e9b77a7931ceb69eac458634acdc904e30f0e3d
Fixes-Bug: #127460