This change removes plugins from Spyglass and places them in separate
repositories. Formation, a proprietary plugin, will be removed by this
change and Tugboat will become its own OpenDev maintained repo,
spyglass-plugin-xls. By creating more streamlined plugin management,
end users should be able to more easily create their own plugins for
different data sources.
Related change https://review.opendev.org/#/c/659116/
Depends-On: Ib2f75878b1a29e835cb8e2323aebe9d431c479e7
Change-Id: Ie0eb2e5aefe6bb764e1aa608e53371adaabb9a17
a002e4203d