EMC SMI-S delete snapshot unit test takes too long

EMC SMI-S unit test for deleting snapshot takes too long.
This patch sets Timout to 0 in cinder_emc_config.xml
so that it will return immediately.  Without this fix,
it will wait for 10 seconds by default.

Change-Id: I223f6741a2ce393e555467350201a695ae210152
Closes-Bug: #1289653
Merge "EMC SMI-S delete snapshot unit test takes too long"