- modify NewVariableCorrectionProposal.doAddParam() to look if
  last parameter is a varargs parameter to determine if added
  parameter should be last or second last
- add new tests to UnresolvedMethodsQuickFixTest

Change-Id: I4a3a5b98f9060ce0add6a67af98d428f750bf871
Signed-off-by: Jeff Johnston <jjohnstn@redhat.com>