EMC VMAX - get_short_host_name not called in find_device_number

EMC VMAX - get_short_host_name not called in find_device_number

The get_short_host_name needs to be called in find_device_number.
There are 2 reasons for this:
1. Sometimes the full host name is contained in the
   connector['host'] object.
2. When the short host name still exceeds 38 characters,
   it must be truncated, in order to guarantee a "contains string"
   match between the host and the masking view name.

Change-Id: I9631f33eafe2cfb64388d8e19c6ed8d1e948a6fa
Closes-Bug: #1520635