SELinux: allow openssl access to /run/keystone

On RHEL, openssl is being denied access to /run/keystone. This issue
was fixed on Fedora and that fix needs to be merged into the RHEL
selinux-policy package. In the meantime, this custom policy is needed.

Change-Id: I93c85ed883fc5f6f05ff37bb8f05eee0e53f1b78
Related-Bug: 1376038
Merge "SELinux: allow openssl access to /run/keystone"