Hard coded MD5 hashing algorithm prevents FIPS compliance

[provide a description of the issue]
Files such as:
https://github.com/openshift/origin/blob/388478c40e751c4295dcb9a44dd69e5ac65d0e3b/pkg/auth/authenticator/password/htpasswd/md5.go

Rely on hard coded MD5 hashing algorithms. This results in systems that are FIPS enabled to cause runtime errors. By removing the hard coded MD5 and replacing it with SHA-2 (or any FIPS compliant hashing algorithm) systems requiring FIPS support can run OpenShift.

Version

[provide output of the openshift version or oc version command]
master branch

Steps To Reproduce

1. [step 1]
2. [step 2]

Current Result

Expected Result

Additional Information

[try to run $ oadm diagnostics command if possible]
[if you are reporting issue related to builds, provide build logs with BUILD_LOGLEVEL=5]
[consider attaching output of the $ oc get all -o json -n <namespace> command to the issue]
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