Description of problem:
Can't trigger job in jenkins webconsole due to below error
Could not create BuildConfig resource frontend in namespace test for subresource instantiate: {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"the body of the request was in an unknown format - accepted media types include: application/json, application/yaml","reason":"UnsupportedMediaType","code":415}

Works with latest ci.dev.openshift.redhat.com:5000/openshift/jenkins-1-rhel7(a1653bcc8261) 
Version-Release number of selected component (if applicable):
ose 3.2 RC
jenkins-1-rhel7 (ac9dd63162a5)

How reproducible:
always

Steps to Reproduce:
1.Create a jenkins pods following 
https://github.com/openshift/origin/blob/master/examples/jenkins/README.md
2.Create the sample application configuration
3.Trigger job in jenkins webconsole

Actual results:

Errors shown in consoleout page.
BUILD STEP:  OpenShiftBuilder in perform for frontend on namespace test
ERROR: Build step failed with exception
com.openshift.restclient.OpenShiftException: Could not create BuildConfig resource frontend in namespace test for subresource instantiate: {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"the body of the request was in an unknown format - accepted media types include: application/json, application/yaml","reason":"UnsupportedMediaType","code":415}

	at com.openshift.internal.restclient.DefaultClient.createOpenShiftException(DefaultClient.java:475)
	at com.openshift.internal.restclient.DefaultClient.create(DefaultClient.java:227)
	at com.openshift.internal.restclient.capability.resources.BuildTrigger.trigger(BuildTrigger.java:59)
	at com.openshift.jenkins.plugins.pipeline.OpenShiftBuilder$2.visit(OpenShiftBuilder.java:113)
	at com.openshift.jenkins.plugins.pipeline.OpenShiftBuilder$2.visit(OpenShiftBuilder.java:111)
	at com.openshift.internal.restclient.model.KubernetesResource.accept(KubernetesResource.java:86)
	at com.openshift.jenkins.plugins.pipeline.OpenShiftBuilder.coreLogic(OpenShiftBuilder.java:111)
	at com.openshift.jenkins.plugins.pipeline.OpenShiftBaseStep.perform(OpenShiftBaseStep.java:143)
	at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
	at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:785)
	at hudson.model.Build$BuildExecution.build(Build.java:205)
	at hudson.model.Build$BuildExecution.doRun(Build.java:162)
	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:537)
	at hudson.model.Run.execute(Run.java:1741)
	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
	at hudson.model.ResourceController.execute(ResourceController.java:98)
	at hudson.model.Executor.run(Executor.java:408)
Caused by: com.openshift.internal.restclient.http.HttpClientException: {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"the body of the request was in an unknown format - accepted media types include: application/json, application/yaml","reason":"UnsupportedMediaType","code":415}

	at com.openshift.internal.restclient.http.UrlConnectionHttpClient.createException(UrlConnectionHttpClient.java:225)
	at com.openshift.internal.restclient.http.UrlConnectionHttpClient.request(UrlConnectionHttpClient.java:190)
	at com.openshift.internal.restclient.http.UrlConnectionHttpClient.post(UrlConnectionHttpClient.java:123)
	at com.openshift.internal.restclient.DefaultClient.create(DefaultClient.java:223)
	... 15 more
Caused by: java.io.IOException: Server returned HTTP response code: 415 for URL: https://openshift.default.svc.cluster.local/oapi/v1/namespaces/test/buildconfigs/frontend/instantiate
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1840)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1441)
	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)
	at com.openshift.internal.restclient.http.UrlConnectionHttpClient.request(UrlConnectionHttpClient.java:186)
	... 17 more
Build step 'Perform builds in OpenShift' marked build as failure
Finished: FAILURE


Expected results:
Could trigger job in jenkins web console

Additional info:

Check this page 
https://openshift-129.lab.sjc.redhat.com:8443/oapi/v1/namespaces/test/buildconfigs/frontend/instantiate

{
  "kind": "Status",
  "apiVersion": "v1",
  "metadata": {},
  "status": "Failure",
  "message": "User \"system:anonymous\" cannot get buildconfigs/instantiate in project \"test\"",
  "reason": "Forbidden",
  "details": {
    "name": "frontend",
    "kind": "buildconfigs/instantiate"
  },
  "code": 403
}