The NSX3Client did not get the nsx managers IPs, and they where missing
from error messages.
To fix this, and also better fix a similar problem with max_attempts,
the client init method may get another instance of the client, and copy
relevant information from it.
This option is used by the copy-constructor "new_client_for" without the
RestClient class being aware of arguments relevant only to the NSXClient.
Also adding a new test for a resource error message, to make sure it contains
the nsx_manager ip.
Change-Id: I9e7e28eb5fd69ace44547d40cf8cd09e2457c5ed
93fa5bcb47