MB-13017: start inets app for logs collection preflight function

Otherwise, attempt to call httpc:request fails with noproc error.

Apparently as part of couchdb separation we've removed some call to
inets:start from somewhere in the guts of our stack. This commit
returns startup of inets application back.

Change-Id: I262a7dbfd65ca510c7ba6672cf046e24108cd36f
Reviewed-on: http://review.couchbase.org/44779
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>