Move impersonate user from nursery

[JakePeralta7]

Added example and moved from nursery to host-interaction/user.

mandiant/capa-testfiles#293

P.S. There is no need for the *Ex or clause, right?

[mike-hunhoff]

Nice, I've left a quick comment for you to address.

[mike-hunhoff]

Also @JakePeralta7 , lints are failing now:

INFO     lint: rule "impersonate user" does not match for sample     lint.py:409
         bf9a888e226d8396e84e042732daf32b8c1df8fd675eb128e8da3f0d776            
         8bea5                                                                  

 impersonate user
  FAIL: doesn't match on referenced example: Fix the rule logic or provide a 
different example

[JakePeralta7]

Also @JakePeralta7 , lints are failing now:

INFO     lint: rule "impersonate user" does not match for sample     lint.py:409
         bf9a888e226d8396e84e042732daf32b8c1df8fd675eb128e8da3f0d776            
         8bea5                                                                  

 impersonate user
  FAIL: doesn't match on referenced example: Fix the rule logic or provide a 
different example

Yeah, that's because of the Ex

[mike-hunhoff]

Nice, LGTM 🚀