Nodepoold is being changed to gracefully stop on SIGINT instead of
SIGUSR1: https://review.openstack.org/#/c/206562/
Given above patch, nodepoold ignore each signals while one of them is
being handled. Hence adjust the init script to send both SIGINT and
SIGUSR1 to keep back compatibility with old nodepoold versions.
Depends-On: Ic403b9cc74bc991b682819bc4663bb4630933a8e
Change-Id: Icb93d7979806710d7998c11dadf307d4ae4422fc
16c9a82ec3