Change Redirect to Auth from Permanent(301) to Temporary(302 or 307)

[kishansagathiya]

local issue for https://github.com/openshiftio/openshift.io/issues/3392

301 is very problematic, It could create a link instead of directly redirecting.

https://github.com/kishansagathiya/fabric8-jenkins-proxy/blob/master/internal/proxy/proxy.go#L342