bp: Always require local_alert key argument to have a node.

Change-Id: I7238ec6500c1f0c462762779bf575b198fb3c030
Orig-Reviewed-on: http://review.couchbase.org/37206
Orig-Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Orig-Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-on: http://review.couchbase.org/42853
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
bp: MB-11137 Fix sending mail alerts for compound keys.

Change-Id: Ie2312d8aa4e7b26f958988427d57c8c399b62ce4
Orig-Reviewed-on: http://review.couchbase.org/37207
Orig-Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Orig-Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-on: http://review.couchbase.org/42854
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Merge remote-tracking branch 'origin/2.5.1.1' into rel-3.0.0++

* origin/2.5.1.1:
  bp: MB-11137 Fix sending mail alerts for compound keys.
  bp: Always require local_alert key argument to have a node.

This is empty merge of backports

Change-Id: I9a5c1a5265be07177d159ff89e56acb373ab4fe0