gpg: Look up user ID to revoke by UID hash
* g10/keyedit.c (find_userid_by_namehash, find_userid): New. (keyedit_quick_revuid): Use find_userid() instead of iterating over the nodes of the keyblock. * tests/openpgp/quick-key-manipulation.scm: Add test for revoking a user ID specified by its hash.
This makes it possible to specify the user ID to revoke as UID hash when
calling --quick-revoke-uid.
- GnuPG-bug-id: T5936