Exported utility functions for RTC and system sleep

Exported utility functions for RTC and system sleep

Converted the suspend and RTC functions from module methods
in bin/base_utils.py to separate modules in common_lib/ which
have no cross dependencies.  The downside to this apprach is
that we don't use utils.run() to call powerd_supspend, which
loses us a little logging.  This will allow otherse to use
these modules in non-autotest-embedded test scripts.

BUG=none
TEST=rerun power_Resume test using run_remote_tests, manually grep
for all moved function names in the rest of the autotest source tree.

Committed: http://chrome-svn/viewvc/chromeos?view=rev&revision=7a0e9d4

[Sameer Nanda, 2010-09-28 22:49:54]

LGTM