[PR PATCH] [Updated] Make Samba autobuild more parallel

[github at samba.org]

There is an updated pull request by abartlet against master on the Samba Samba Github repository

https://github.com/abartlet/samba abartlet-gitlab-ci
https://github.com/samba-team/samba/pull/148

Make Samba autobuild more parallel
This patch series allows Samba autobuilds on sn-devel to run in about 3 hours. 

It also uses that same split-up to enable builds on Travis CI for GitHub (allowing much more comprehensive tests for new pull requests) and GitLab CI (once appropriate runners are configured). 

We also test more build combinations and include fixes for winbindd that made those tests excessively long. 

I've also compared the list of tests run between this and master and they are as expected
[test-list.diff.txt](https://github.com/samba-team/samba/files/1835777/test-list.diff.txt)



A patch file from https://github.com/samba-team/samba/pull/148.patch is attached
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