linux-cp: stop signaling read event on every notif
linux-cp: stop signaling read event on every notif

Type: improvement

Currently, read event signal is sent on every notification message
received and added in the queue.

With this change, signal read event only when all currently available
notification messages are received.

Signed-off-by: Alexander Chernavin <005bca4307cd9b117df45182181fee477edfa768@netgate.com>
Change-Id: Ib86d189311ce01f50167e4e97feb99df0292ad96

chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp