Description of problem:
After user new a secret, then add it to a ServiceAccount, when user want to remove it from the ServiceAccount, no such option to do that.

#  oc secrets --help
Manage secrets in your project

Secrets are used to store confidential information that should not be contained inside of an image.
They are commonly used to hold things like keys for authentication to other internal systems like 
Docker registries.

Usage:
  oc secrets [options]

Available Commands:
  new           Create a new secret based on a key file or on files within a directory
  new-dockercfg Create a new dockercfg secret
  new-basicauth Create a new secret for basic authentication
  new-sshauth   Create a new secret for SSH authentication
  add           Add secrets to a ServiceAccount

Use "oc help <command>" for more information about a given command.
Use "oc options" for a list of global command-line options (applies to all commands).

Version-Release number of selected component (if applicable):
atomic-openshift-3.1.1.908-1.git.0.d5f3fef.el7.x86_64

How reproducible:
Always

Steps to Reproduce:
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Actual results:


Expected results:


Additional info: