CA-80421: when adding an item to a queue, don't forget to signal
CA-80421: when adding an item to a queue, don't forget to signal

This could cause a temporary glitch where a thread blocked in pop()
wouldn't wake up as early as it should.

Signed-off-by: David Scott <63c9eb0ea83039690fefa11afe17873ba8278a56@eu.citrix.com>

johnelse/xcp-rrdd,djs55/squeezed,simonjbeaumont/xcp-rrdd,djs55/xcp-networkd,koushikcgit/xcp-rrdd,robhoes/squeezed,koushikcgit/xcp-networkd,koushikcgit/xcp-rrdd,sharady/xcp-networkd,simonjbeaumont/xcp-rrdd,djs55/xcp-rrdd,djs55/xcp-rrdd,koushikcgit/xcp-rrdd,djs55/xcp-networkd,johnelse/xcp-rrdd,sharady/xcp-networkd,koushikcgit/xcp-networkd