moved action validation into context package; context tests not yet fixed
tests WIP
Modified PowerShell Charm resources dir.
merge parent, resolve conflicts
merge imminent future parent, fix conflicts
beef up tests
Merge branch 'uniter-context-export-flush' into uniter-action-context-2
finally fix crazy tests in not-very-happy-making way
Merge branch 'master' into uniter-action-context-2
drop redundant runner code
address review
state/multiwatcher: move Delta type to this package
cleanup
Implement diskmanager worker
worker/diskmanager: add tests
Update dependencies and fix intermittent test failure.
api/diskmanager: add tests
apiserver/diskmanager: add tests
ok, fine, I'll handle those api errors, even though I'm pretty sure we *shouldn't* be getting them in the sometimes-failing uniter test
Fix worker/diskmanager interface; fix vet warning

Make version.OSType a Stringer so it can be used as
argument to %s in printf functions.