uac.reg_add realm and socket support for RPC command

[sznoname]

Pre-Submission Checklist

• Commit message has the format required by CONTRIBUTING guide
• Commits are split per component (core, individual modules, libs, utils, ...)
• Each component has a single commit (if not, squash them into one commit)
• No commits to README files for modules (changes must be done to docbook files
  in doc/ subfolder, the README file is autogenerated)

Type Of Change

• Small bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds new functionality)
• Breaking change (fix or feature that would change existing functionality)

Checklist:

• PR should be backported to stable branches
• Tested changes locally
• Related to issue #XXXX (replace XXXX with an open issue number)

Description

[henningw]

@sznoname I see you closed the PR - do you like to re-work it, or was it not complete yet?

[henningw]

Thank you, merged. Small remark, please use the proper format for the commit message for eventual future pull requests, the module should be used as a prefix. Example:

uac: reg_add realm and socket support for RPC command

[hance2010]

Thanks!