Detect mirrord running mirrord

[aviramha]

Some of our users integrate mirrord into their build/run scripts, for example in package.json they do 'mirrord exec ..'
Problem is when they also use the IDE they sometime enable it there causing mirrord to run within mirrord, so second mirrord usually fails because remote service account doesn't have permissions, and if it works then it's probably causing slowness.
We should be able to detect such scenario from cli and warn/abort
I'm leaning towards about.

[linear]

MBE-447 Detect mirrord running mirrord