Use hanging get to fetch sshKeys
Don't sleep when fetching the list of accounts

We no longer need to sleep since GetDesiredAccounts method now does a hanging get and will not return if there are no changes.
Remove the code which attempted to try for 10 seconds

Also, persist etag for sshKeys across method calls.
Add a new flag to specify if accounts manager should make a single pass or run in loop
renaming single_attempt variable to single_pass
Switching to use single-pass flag instead of interval
Use single-pass flag in the one shot run
Fixing typo
fixing flag
fixing the way we pass single-pass flag
Pass the etag for sshKeys from child to parent process
Added logging for passing etag to parent
Merge remote-tracking branch 'upstream/master'

Conflicts:
	google-daemon/etc/init/google-accounts-manager-task.conf
use the etag value from previous call when fetching attributes
use friendly names for reader writer from pipe
Merge pull request #37 from HimanshuVasishth/master

Adding support for hanging get