guests/solaris: merge config properly [GH-5092]

CHANGELOG.md

@@ -14,6 +14,8 @@ BUG FIXES:
       strategy name [GH-4975]
   - commands/push: validate the configuration
   - guests/arch: fix network configuration due to poor line breaks. [GH-4964]
+  - guests/solaris: Merge configurations properly so configs can be set
+      in default Vagrantfiles. [GH-5092]
   - providers/docker: Symlinks in shared folders work. [GH-5093]
   - providers/hyperv: VM start errors turn into proper Vagrant errors. [GH-5101]
   - provisioners/chef: remove Chef version check from solo.rb generation and

plugins/guests/solaris/config.rb

@@ -3,24 +3,28 @@ module VagrantPlugins
     class Config < Vagrant.plugin("2", :config)
       attr_accessor :halt_timeout
       attr_accessor :halt_check_interval
-      # This sets the command to use to execute items as a superuser. sudo is default
+
       attr_accessor :suexec_cmd
       attr_accessor :device
 
       def initialize
         @halt_timeout = UNSET_VALUE
         @halt_check_interval = UNSET_VALUE
-        @suexec_cmd = 'sudo'
-        @device = "e1000g"
+        @suexec_cmd = UNSET_VALUE
+        @device = UNSET_VALUE
       end
 
       def finalize!
         if @halt_timeout != UNSET_VALUE
           puts "solaris.halt_timeout is deprecated and will be removed in Vagrant 1.7"
         end
+
         if @halt_check_interval != UNSET_VALUE
           puts "solaris.halt_check_interval is deprecated and will be removed in Vagrant 1.7"
         end
+
+        @suexec_cmd = "sudo" if @suexec_cmd == UNSET_VALUE
+        @device     = "e1000g" if @device == UNSET_VALUE
       end
     end
   end