Add test for target parameters and fix requests lib error

1. Adds test for target-* parameters.
2. Fixes an error that is caused by requests not accepting non-string
   header parameters https://github.com/requests/requests/issues/3477

Closes-Bug: 1708099
Change-Id: Ia5d1ad5062751c15928cbfd7709665a3ed769603

mistralclient/api/httpclient.py

@@ -178,7 +178,10 @@ class HTTPClient(object):
             headers['X-Target-User-Id'] = self.target_user_id
 
         if self.target_insecure:
-            headers['X-Target-Insecure'] = self.target_insecure
+            # Note(akovi): due to changes in requests, this parameter
+            # must be a string. Basically, it is a truthy value on
+            # the server side.
+            headers['X-Target-Insecure'] = str(self.target_insecure)
 
         if self.target_region_name:
             headers['X-Target-Region-Name'] = self.target_region_name

mistralclient/tests/functional/cli/v2/cli_tests_v2.py

@@ -2038,3 +2038,21 @@ class NegativeCLITests(base_v2.MistralClientTestBase):
             'action-execution-update',
             params='%s ERROR' % direct_ex_id
         )
+
+    def test_target_action_execution(self):
+        command = (
+            '--debug '
+            '--os-target-tenant-name={tenantname} '
+            '--os-target-username={username} '
+            '--os-target-password="{password}" '
+            '--os-target-auth-url="{auth_url}" '
+            '--target_insecure '
+            'run-action heat.stacks_list'
+        ).format(
+            tenantname=self.clients.tenant_name,
+            username=self.clients.username,
+            password=self.clients.password,
+            auth_url=self.clients.uri
+        )
+
+        self.mistral_alt_user(cmd=command)

mistralclient/tests/unit/test_httpclient.py

@@ -162,7 +162,7 @@ class HTTPClientTest(base.BaseClientTest):
         self.assertEqual(target_auth_token, headers['X-Target-Auth-Token'])
         self.assertEqual(target_user_id, headers['X-Target-User-Id'])
         self.assertEqual(target_project_id, headers['X-Target-Project-Id'])
-        self.assertEqual(target_insecure, headers['X-Target-Insecure'])
+        self.assertEqual(str(target_insecure), headers['X-Target-Insecure'])
         self.assertEqual(target_region, headers['X-Target-Region-Name'])
         self.assertEqual(target_user_domain_name,
                          headers['X-Target-User-Domain-Name'])