Increase timeout for decomission operation
Increase timeout for decomission operation

Recently we saw a number of integration tests failure due to timeout
during nodes decommision. Right now it is 30 seconds. There is no
reason to keep it that low, and increasing it to 5 minutes should
help avoid false failures on CI.

Change-Id: Ibaba8a55879a95255beae260647022777938c38f

citrix-openstack-build/sahara,matips/iosr-2015,matips/iosr-2015,tellesnobrega/sahara,esikachev/scenario,mapr/sahara,xme1226/sahara,esikachev/scenario,ekasitk/sahara,crobby/sahara,zhujzhuo/Sahara,egafford/sahara,redhat-openstack/sahara,xme1226/sahara,crobby/sahara,ekasitk/sahara,esikachev/sahara-backup,esikachev/sahara-backup,esikachev/sahara-backup,keedio/sahara,redhat-openstack/sahara,citrix-openstack-build/sahara,ekasitk/sahara,zhangjunli177/sahara,tellesnobrega/storm_plugin,mapr/sahara,esikachev/scenario,henaras/sahara,openstack/sahara,openstack/sahara,zhangjunli177/sahara,keedio/sahara,bigfootproject/sahara,zhujzhuo/Sahara,xme1226/sahara,tellesnobrega/storm_plugin,bigfootproject/sahara,crobby/sahara,tellesnobrega/sahara,bigfootproject/sahara,zhangjunli177/sahara,citrix-openstack-build/sahara,zhujzhuo/Sahara,redhat-openstack/sahara,mapr/sahara,matips/iosr-2015,keedio/sahara,egafford/sahara,henaras/sahara,tellesnobrega/storm_plugin,henaras/sahara