(maint) Use a Beaker::Host instance when mocking hosts

The mock hosts being generated for tests where failing when :exec was
called, despite the allow() in the helpers.rb make_host() function.
Using a Beaker::Host resolved this.

spec/beaker-pe/install/pe_utils_spec.rb

@@ -364,7 +364,7 @@ def prep_host(host)
     end
 
     def slice_installer_options(host)
-      host.select { |k,v| [ :pe_installer_conf_file, :pe_installer_conf_setting].include?(k) }
+      host.host_hash.select { |k,v| [ :pe_installer_conf_file, :pe_installer_conf_setting].include?(k) }
     end
 
     context 'when version < 2016.2.0' do
@@ -1602,12 +1602,12 @@ def test_setup(mock_values)
     it { expect(subject.get_console_dispatcher_for_beaker_pe).to be_nil }
     it do
       expect { subject.get_console_dispatcher_for_beaker_pe(true) }.to(
-        raise_exception(LoadError, /cannot load.*scooter/) 
+        raise_exception(LoadError, /cannot load.*scooter/)
       )
     end
     it do
       expect { subject.get_console_dispatcher_for_beaker_pe! }.to(
-        raise_exception(LoadError, /cannot load.*scooter/) 
+        raise_exception(LoadError, /cannot load.*scooter/)
       )
     end
   end

spec/helpers.rb

@@ -76,9 +76,9 @@ def make_host_opts name, opts
   end
 
   def make_host name, host_hash
-    host_hash = StringifyHash.new.merge(HOST_DEFAULTS.merge(host_hash))
+    host_hash = Beaker::Options::OptionsHash.new.merge(HOST_DEFAULTS.merge(host_hash))
 
-    host = make_opts.merge(host_hash)
+    host = Beaker::Host.create( name, host_hash, make_opts)
 
     allow(host).to receive( :name ).and_return( name )
     allow(host).to receive( :hostname ).and_return( "#{name}.test" )