[Cleanup] remove version check, since we only support from 4 and higher now

Author: Johan De Wit

lib/puppet/provider/mongodb.rb

@@ -234,30 +234,4 @@ def mongo_version
     self.class.mongo_version
   end
 
-  def self.mongo_4?
-    v = mongo_version
-    !v[%r{^4\.}].nil?
-  end
-
-  def mongo_4?
-    self.class.mongo_4?
-  end
-
-  def self.mongo_5?
-    v = mongo_version
-    !v[%r{^5\.}].nil?
-  end
-
-  def mongo_5?
-    self.class.mongo_5?
-  end
-
-  def self.mongo_6?
-    v = mongo_version
-    !v[%r{^6\.}].nil?
-  end
-
-  def mongo_6?
-    self.class.mongo_6?
-  end
 end

lib/puppet/provider/mongodb_user/mongodb.rb

@@ -127,9 +127,7 @@ def password=(value)
       digestPassword: true
     }
 
-    if mongo_4? || mongo_5? || mongo_6?
-      command[:mechanisms] = @resource[:auth_mechanism] == :scram_sha_256 ? ['SCRAM-SHA-256'] : ['SCRAM-SHA-1']
-    end
+    command[:mechanisms] = @resource[:auth_mechanism] == :scram_sha_256 ? ['SCRAM-SHA-256'] : ['SCRAM-SHA-1']
 
     mongo_eval("db.runCommand(#{command.to_json})", @resource[:database])
   end

spec/unit/puppet/provider/mongodb_spec.rb

@@ -23,9 +23,6 @@
     v.each do |key, results|
       it "version detection for [#{key}]" do
         allow(provider_class).to receive(:mongo_eval).with('db.version()').and_return(key)
-        expect(provider_class.mongo_4?).to be results['4']
-        expect(provider_class.mongo_5?).to be results['5']
-        expect(provider_class.mongo_6?).to be results['6']
       end
     end
   end