Currently there is ambiguity in the third party documentation
around requesting accounts. Some have interpreted the documentation
as stating it is possible to conduct tests using a gerrit user
account. This patch addresses the documentation language making
it clear that a third party ci system is required for third party
ci interactions with gerrit and the system must be created by
infra.
This patch also changes the recommended method of requesting a
third party ci account from three choices (email, bug or irc) to
one choice (email). This edit was previously part of
https://review.openstack.org/#/c/101013/ and has been moved into
this patch.
Change-Id: Iab88b729d714dcaa881376e9237834e877acecfa