Add command to manually trigger a service election

[davidMcneil]

Currently, this functionality is hidden behind a feature flag HAB_FEAT_TRIGGER_ELECTION. This feature should be flushed out and stabilized. A command along the lines of hab svc election <svc name> could be very useful.

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[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. We value your input and contribution. Please leave a comment if this issue still affects you.

[teknofire]

This feature would be a huge benefit for the Automate HA work that makes heavy use of the leader strategy for PostgreSQL, currently to force a change in leadership we have to shutdown the entire hab supervisor which kills any other services that are also running on the system.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. We value your input and contribution. Please leave a comment if this issue still affects you.