Several fixes and improvements

JSON fixed for service_info. Necessary for metacd-http
Finer decache in resolver. Idem, necessary for metacd-http.
m2v2_remote_touch_content fixed. Idem, necessary for metacd-http.
m2v2 does not generates events when disabled, and verbosity lowered.

Change-Id: Ib145ba973ad7d9f3810c4c0fa4f30f1be1ff4639