[backport 1-3] - Remove bmhs address from no_proxy

Remi Le Trocquerrequested to merge
backport_remove_bmh_from_proxy into release-1.3

Close ##1950 (closed)

Backport of !4211 (merged)

Quick explanation:
Remove the automatic addition of bmhs addresses in the no_proxy.
This seems unnecessary (ironic does not use the proxy) and causes a rolling-upgrade as soon as a bmh is added or deleted.

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