Description of problem:
Error getting when request token from web console

Version-Release number of selected component (if applicable):
openshift v3.7.0-0.125.0
kubernetes v1.7.0+695f48a16f
etcd 3.2.1

How reproducible:
always

Steps to Reproduce:
1.Request token from web console:

  https://master_url:8443/oauth/token/request

  input the username/password
2.
3.

Actual results:
Error getting token: The client is not authorized to request a token using this method

Expected results:
Token reqeust successfully.

Additional info:
Sep 13 08:36:17 qe-37-saml-master-etcd-1 atomic-openshift-master-api[25190]: logging error output: "\n<style>\n\tbody     { font-family: sans-serif; font-size: 14px; margin: 2em 2%; background-color: #F9F9F9; }\n\th2       { font-size: 1.4em;}\n\th3       { font-size: 1em; margin: 1.5em 0 0; }\n\tcode,pre { font-family: Menlo, Monaco, Consolas, monospace; }\n\tcode     { font-weight: 300; font-size: 1.5em; margin-bottom: 1em; display: inline-block;  color: #646464;  }\n\tpre      { padding-left: 1em; border-radius: 5px; color: #003d6e; background-color: #EAEDF0; padding: 1.5em 0 1.5em 4.5em; white-space: normal; text-indent: -2em; }\n\ta        { color: #00f; text-decoration: none; }\n\ta:hover  { text-decoration: underline; }\n\t@media (min-width: 768px) {\n\t\t.nowrap { white-space: nowrap; }\n\t}\n</style>\n\n"
Sep 13 08:36:17 qe-37-saml-master-etcd-1 atomic-openshift-master-api[25190]: logging error output: "\n  "
Sep 13 08:36:17 qe-37-saml-master-etcd-1 atomic-openshift-master-api[25190]: logging error output: "Error getting token: The client is not authorized to request a token using this method."
Sep 13 08:36:17 qe-37-saml-master-etcd-1 atomic-openshift-master-api[25190]: logging error output: "\n"
Sep 13 08:36:17 qe-37-saml-master-etcd-1 atomic-openshift-master-api[25190]: logging error output: "\n\n<br><br>\n<a href=\""
Sep 13 08:36:17 qe-37-saml-master-etcd-1 atomic-openshift-master-api[25190]: logging error output: "request"
Sep 13 08:36:17 qe-37-saml-master-etcd-1 atomic-openshift-master-api[25190]: logging error output: "\">Request another token</a>\n"
Sep 13 08:36:17 qe-37-saml-master-etcd-1 atomic-openshift-master-api[25190]: [[Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:55.0) Gecko/20100101 Firefox/55.0] 66.187.233.202:47060]