[Tools][CISupport] start-local-buildbot-server fails to start or detect the http config ports

[Carlos Alberto Lopez Perez]

I was testing some patches to the buildbot config with the script start-local-buildbot-server and the script is failing here:

1) when running with the config for the post-commit bot the script is failing to detect the http_port configured for the server.
2) when running with the config for the ews bot the script is failing to install some required new python modules on the virtualenv, which leads to a general failure later when trying to start buildbot with that config


Let's try to fix this

[Carlos Alberto Lopez Perez]

Pull request: https://github.com/WebKit/WebKit/pull/13421

[EWS]

Committed 263676@main (7b95348e5109): <https://commits.webkit.org/263676@main>

Reviewed commits have been landed. Closing PR #13421 and removing active labels.

[Radar WebKit Bug Importer]

<rdar://problem/108895036>