Upgrade, increase timeout for containers stopping

Stop container call send 9 signal after
10 seconds, sometimes it can interrupt
non atomic operations, such as keystone
database migration.
Increase timeout to prevent such issues.

Change-Id: Ia6c09ea0b14fba61c141959a2d065b487d1970ef
Closes-bug: #1364087
Merge "Upgrade, increase timeout for containers stopping"