[RFE] Dynamically allocate console port

[Vladyslav Drok]

Currently the way to enable console is to specify a terminal_port parameter, then if start console, shellinabox/socat will run with the terminal_port. there could be some nodes with same port number in a conductor server, so only one console can be enabled, and if the node is taken over by another conductor, the port may also be used by another shellinabox/socat service in that server. This is unacceptable, so I suggest to add a mechanism to manage the console port instead of specified by users.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/258915

[OpenStack Infra (hudson-openstack)]

Change abandoned by Zhenguo Niu (<email address hidden>) on branch: master
Review: https://review.openstack.org/258915
Reason: move to https://review.openstack.org/#/c/257789/

[Jim Rollenhagen (jim-rollenhagen)]

Spec is here: https://review.openstack.org/#/c/249876/

[Zhenguo Niu (niu-zglinux)]

update description to not only specify to shellinabox but also the new introduced console driver socat

[OpenStack Infra (hudson-openstack)]

Change abandoned by Zhenguo Niu (<email address hidden>) on branch: master
Review: https://review.opendev.org/249876

[OpenStack Infra (hudson-openstack)]

Change abandoned by Zhenguo Niu (<email address hidden>) on branch: master
Review: https://review.opendev.org/257789