[stable/antelope] Add name parameter to send_application_name

[rodrigogansobarbieri]

This way, multiple nova-compute applications can share the same ceph key, as nova can invoke send_application_name('nova-compute').

(cherry picked from commit 6a19a0a7090ea552118a7d220a49ab4c66ed6fb9)

[rodrigogansobarbieri]

rebased on top of stable/antelope so the PR is now just 1 commit