[freeipa PR#3918][opened] [Backport][ipa-4-6] Do not run trust upgrade code if master lacks Samba bindings

[t-woerner]

URL: https://github.com/freeipa/freeipa/pull/3918
Author: t-woerner
 Title: #3918: [Backport][ipa-4-6] Do not run trust upgrade code if master lacks Samba bindings
Action: opened

PR body:
"""
This PR was opened automatically because PR #3910 was pushed to master and backport to ipa-4-6 is required.
"""

To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/3918/head:pr3918
git checkout pr3918