Add delete-rpm-sig CLI and deleteRPMSig hub call

Fixes: https://pagure.io/koji/issue/2665

tests/test_cli/data/list-commands-admin.txt

@@ -50,6 +50,7 @@ admin commands:
         remove-group              Remove group from tag
         remove-host-from-channel  Remove a host from a channel
         remove-pkg                Remove a package from the listing for tag
+        remove-sig                Remove signed RPMs from db and disk
         remove-tag                Remove a tag
         remove-tag-inheritance    Remove a tag inheritance link
         remove-target             Remove a build target

tests/test_cli/data/list-commands.txt

@@ -50,6 +50,7 @@ admin commands:
         remove-group              Remove group from tag
         remove-host-from-channel  Remove a host from a channel
         remove-pkg                Remove a package from the listing for tag
+        remove-sig                Remove signed RPMs from db and disk
         remove-tag                Remove a tag
         remove-tag-inheritance    Remove a tag inheritance link
         remove-target             Remove a build target

tests/test_cli/test_remove_sig.py

@@ -0,0 +1,73 @@
+from __future__ import absolute_import
+
+import mock
+from six.moves import StringIO
+
+import koji
+from koji_cli.commands import handle_remove_sig
+from . import utils
+
+
+class TestRemoveSig(utils.CliTestCase):
+    maxDiff = None
+
+    def setUp(self):
+        self.options = mock.MagicMock()
+        self.options.debug = False
+        self.session = mock.MagicMock()
+        self.session.getAPIVersion.return_value = koji.API_VERSION
+
+    def test_delete_sig_help(self):
+        self.assert_help(
+            handle_remove_sig,
+            """Usage: %s remove-sig [options] <rpm-id/n-v-r.a/rpminfo>
+(Specify the --help global option for a list of other help options)
+
+Options:
+  -h, --help       show this help message and exit
+  --sigkey=SIGKEY  Specify signature key
+  --all            Remove all signed copies for specified RPM
+""" % self.progname)
+
+    @mock.patch('sys.stderr', new_callable=StringIO)
+    def test_delete_sig_without_option(self, stderr):
+        expected = "Usage: %s remove-sig [options] <rpm-id/n-v-r.a/rpminfo>\n" \
+                   "(Specify the --help global option for a list of other help options)\n\n" \
+                   "%s: error: Please specify an RPM\n" % (self.progname, self.progname)
+        with self.assertRaises(SystemExit) as ex:
+            handle_remove_sig(self.options, self.session, [])
+        self.assertExitCode(ex, 2)
+        self.assert_console_message(stderr, expected)
+
+    @mock.patch('sys.stdout', new_callable=StringIO)
+    def test_delete_sig_non_exist_rpm(self, stdout):
+        rpm = '1234'
+        expected = "No such rpm in system: %s\n" % rpm
+        self.session.getRPM.return_value = None
+        handle_remove_sig(self.options, self.session, [rpm, '--all'])
+        self.assert_console_message(stdout, expected)
+        self.session.getRPM.assert_called_with('1234')
+        self.session.deleteRPMSig.assert_not_called()
+
+    def test_delete_sig_valid(self):
+        rpm = '1'
+        rpminfo = {'arch': 'src',
+                   'build_id': 10,
+                   'buildroot_id': None,
+                   'buildtime': 1618361584,
+                   'epoch': None,
+                   'external_repo_id': 0,
+                   'external_repo_name': 'INTERNAL',
+                   'extra': None,
+                   'id': 1,
+                   'metadata_only': False,
+                   'name': 'koji',
+                   'payloadhash': 'c2b13f978c45e274c856e0a4599842a4',
+                   'release': '1.fc34',
+                   'size': 1178794,
+                   'version': '1.24.1'}
+        self.session.getRPM.return_value = rpminfo
+        self.session.deleteRPMSig.return_value = None
+        handle_remove_sig(self.options, self.session, [rpm, '--sigkey', 'testkey'])
+        self.session.getRPM.assert_called_with('1')
+        self.session.deleteRPMSig.assert_called_with('1', sigkey='testkey')