Add explicit import of _ to hp_3par_fc and iscsi

Messages using translation were added to the hp_3par_fc and
hp_3par_iscsi files but an explicit import of gettextutils _ was not
included.

This fixes that problem.

Change-Id: I2555860c6525a00295e823ab8c826b2bec6a3098
Closes-Bug: 1347184
Merge "Add explicit import of _ to hp_3par_fc and iscsi"