Rename omahaserverip to omahaserver

Refactor time check and URL generation.

BUG=chromium-os:18054
TEST=omaha an image

Change-Id: Ic96e2594a38464c4e15eefbb109d1202c60aaadc
Reviewed-on: http://gerrit.chromium.org/gerrit/4680
Reviewed-by: Nick Sanders <nsanders@chromium.org>
Tested-by: Nick Sanders <nsanders@chromium.org>
1 file changed