add embeddedTemplateDir to some generators (swagger-api#4603)

Author: wing328

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/BashClientCodegen.java

@@ -106,7 +106,7 @@ public BashClientCodegen() {
     /**
      * Templates location for client script and bash completion template.
      */
-    templateDir = "bash";
+    embeddedTemplateDir = templateDir = "bash";
 
 
     /**

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/CppRestClientCodegen.java

@@ -62,7 +62,7 @@ public CppRestClientCodegen() {
         apiTemplateFiles.put("api-header.mustache", ".h");
         apiTemplateFiles.put("api-source.mustache", ".cpp");
 
-        templateDir = "cpprest";
+        embeddedTemplateDir = templateDir = "cpprest";
 
         cliOptions.clear();
 

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/GoClientCodegen.java

@@ -43,7 +43,7 @@ public GoClientCodegen() {
         modelDocTemplateFiles.put("model_doc.mustache", ".md");
         apiDocTemplateFiles.put("api_doc.mustache", ".md");
 
-        templateDir = "go";
+        embeddedTemplateDir = templateDir = "go";
 
         setReservedWordsLowerCase(
             Arrays.asList(

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/JMeterCodegen.java

@@ -68,7 +68,7 @@ public JMeterCodegen() {
      * Template Location.  This is the location which templates will be read from.  The generator
      * will use the resource stream to attempt to read the templates.
      */
-    templateDir = "JMeter";
+    embeddedTemplateDir = templateDir = "JMeter";
 
     /*
      * Api Package.  Optional, if needed, this can be used in templates