superproject: revert not updating commit ids if remote is different.

superproject supports multiple remotes. Get all commit ids
from superproject for all projects that are in the manifest.

$ ./run_tests -v

Bug: [google internal] b/186395810
Change-Id: I6edce3918853a7a3a65aec5528e6a43a544eff53
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/308862
Tested-by: Raman Tenneti <rtenneti@google.com>
Reviewed-by: Jonathan Nieder <jrn@google.com>
Reviewed-by: Mike Frysinger <vapier@google.com>