Avoid monkey patching String to provide unindent

Ruby can do this natively for a while using <<~

Author: ekohl

spec/acceptance/postgresql_psql_spec.rb

@@ -73,7 +73,7 @@ class { 'postgresql::server': } ->
       idempotent_apply(pp_five)
     end
 
-    pp_six = <<-MANIFEST.unindent
+    pp_six = <<~MANIFEST
       class { 'postgresql::server': } ->
       notify { 'trigger': } ~>
       postgresql_psql { 'foobar':
@@ -89,7 +89,7 @@ class { 'postgresql::server': } ->
       apply_manifest(pp_six, expect_changes: true)
     end
 
-    pp_seven = <<-MANIFEST.unindent
+    pp_seven = <<~MANIFEST
       class { 'postgresql::server': } ->
       notify { 'trigger': } ~>
       postgresql_psql { 'foobar':

spec/acceptance/server/default_privileges_spec.rb

@@ -14,7 +14,7 @@
   end
 
   let(:pp_one) do
-    <<-MANIFEST.unindent
+    <<~MANIFEST
       $db = #{db}
       $user = #{user}
       $group = #{group}
@@ -76,7 +76,7 @@ class { 'postgresql::server': }
   end
 
   let(:pp_target_role) do
-    <<-MANIFEST.unindent
+    <<~MANIFEST
       $db = #{db}
       $user = #{user}
       $group = #{group}
@@ -121,7 +121,7 @@ class { 'postgresql::server': }
   end
 
   let(:pp_target_role_revoke) do
-    <<-MANIFEST.unindent
+    <<~MANIFEST
       $db = #{db}
       $user = #{user}
       $group = #{group}
@@ -172,7 +172,7 @@ class { 'postgresql::server': }
   end
 
   let(:pp_schema) do
-    <<-MANIFEST.unindent
+    <<~MANIFEST
       $db = #{db}
       $user = #{user}
       $group = #{group}
@@ -233,7 +233,7 @@ class { 'postgresql::server': }
   end
 
   let(:pp_unset_schema) do
-    <<-MANIFEST.unindent
+    <<~MANIFEST
       $db = #{db}
       $user = #{user}
       $group = #{group}

spec/acceptance/server/deferred_pw_role_spec.rb

@@ -7,7 +7,7 @@
   let(:password) { 'test_password' }
 
   let(:pp_one) do
-    <<-MANIFEST.unindent
+    <<~MANIFEST
       $user = #{user}
       $password = #{password}
 

spec/acceptance/server/grant_role_spec.rb

@@ -11,7 +11,7 @@
     '8.1' if os[:family] == 'redhat' && os[:release].start_with?('5')
   end
   let(:pp_one) do
-    <<-MANIFEST.unindent
+    <<~MANIFEST
       $db = #{db}
       $user = #{user}
       $group = #{group}