op-stop-instructions: change service timeout value to 20 sec

Processor level stop instruction api takes close to 1.5 seconds
including thread status updates. Incase of systems with larger
configuration this service fail to complete. changed service
timeout to 20 seconds to support 8 processor configuration system.

Signed-off-by: Jayanth Othayoth <ojayanth@in.ibm.com>
Change-Id: I36a55f234db7a5f98821cb6362e1e7d95fcf36ef
diff --git a/service_files/op-stop-instructions@.service.in b/service_files/op-stop-instructions@.service.in
index 2eaee19..8d4e666 100644
--- a/service_files/op-stop-instructions@.service.in
+++ b/service_files/op-stop-instructions@.service.in
@@ -13,7 +13,7 @@
 [Service]
 RemainAfterExit=yes
 Type=oneshot
-TimeoutStartSec=10
+TimeoutStartSec=20
 ExecStart=/usr/bin/openpower-proc-control threadStopAll
 
 [Install]