Let's have an option to not package unit-tests

[evshvarov]

Currently, when I install a package on a deployed machine, it installs with all the unit tests.
Could we have an option in publish command to omit unit-tests?
Or maybe have a flag to include them when needed? As usual, there is no need for unit tests on a deployed machine - they are useful for the dev cycle only.

[isc-kiyer]

@evshvarov I agree. The default should be to not package unit tests with a flag to optionally include them if needed

[isc-dchui]

I believe we do not package scoped resources and unit tests are auto-scoped to "test" or "verify". We do need the flag to optionally include them though.