Make @ hack more flexible as a list of revisions may be passed in.
Make @ hack more flexible as a list of revisions may be passed in.

BUG=None
TEST=unittest, pyflakes (found cros_build_lib issue), and svn_revision=<list of urls> and just one and
just revision.

Change-Id: I0bcbb5506af13d2fa58ce73d35f3d7ef6c0500e8
Reviewed-on: http://gerrit.chromium.org/gerrit/10526
Tested-by: Chris Sosa <959d3d631fb6f17f1b07f751372041a1edb210d1@chromium.org>
Reviewed-by: Peter Mayo <3d31fdaf44dc55bb1b4f50b19df9bc879177d37a@chromium.org>

coreos/chromite,chadversary/chromiumos.chromite,bpsinc-native/src_third_party_chromite,chadversary/chromiumos.chromite,coreos/chromite,coreos/chromite,bpsinc-native/src_third_party_chromite,zhang0137/chromite,zhang0137/chromite,bpsinc-native/src_third_party_chromite,zhang0137/chromite