Mark password/secret options as secret

Password, token, and secret options should be marked as secret=True
so that when the value is logged the logger knows to obfuscate the
value.

Conflicts:
	keystoneauth1/extras/_saml2/_loading.py
	keystoneauth1/loading/_plugins/identity/v3.py

- There was no saml2 plugin in keystoneauth1.
- The OpenIDConnectPassword and OpenIDConnectAuthorizationCode
  plugins didn't exist.

Change-Id: I4818c4cc04cc6a4e1e3cf09d5e0b7b4ffefbb892
Closes-Bug: 1534299
(cherry picked from commit fcd9538eaf)

keystoneauth1/loading/_plugins/identity/generic.py

@@ -47,7 +47,8 @@ class Token(GenericBaseLoader):
         options = super(Token, self).get_options()
 
         options.extend([
-            loading.Opt('token', help='Token to authenticate with'),
+            loading.Opt('token', secret=True,
+                        help='Token to authenticate with'),
         ])
 
         return options
@@ -69,6 +70,6 @@ class Password(GenericBaseLoader):
                         deprecated=[loading.Opt('username')]),
             loading.Opt('user-domain-id', help="User's domain id"),
             loading.Opt('user-domain-name', help="User's domain name"),
-            loading.Opt('password', help="User's password"),
+            loading.Opt('password', secret=True, help="User's password"),
         ])
         return options