Speed up test BareMetalPduTestCase.test_exec_pdutool

The test .test_tilera_pdu.BareMetalPduTestCase.test_exec_pdutool had a 9
second sleep in it from tile_power_wait. Set this to 0 for testing.

Change-Id: I294e16b49a11fdfd3b590b3bb970f69a655c75d9
Merge "Speed up test BareMetalPduTestCase.test_exec_pdutool"