ls-projects: Add option to list projects on which a certain group is used

Add a --has-acl-for option to the ls-projects command that allows to
list only projects on which access rights for the specified group are
assigned directly. Projects which only inherit access rights for this
group are not listed.

With this option you can find out on which projects a group is (still)
used, e.g. before removing a group (by deletion in the database).

Change-Id: Iab139425808766fbf4e352584b0035fe1c071d93
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
4 files changed