refactoring for web config

.../java/org/codelibs/fess/app/service/WebConfigService.java

...bs/fess/app/web/admin/webconfig/AdminWebconfigAction.java

...org/codelibs/fess/app/web/admin/webconfig/CreateForm.java

...a/org/codelibs/fess/app/web/admin/webconfig/EditForm.java

...org/codelibs/fess/app/web/admin/webconfig/SearchForm.java

...ain/java/org/codelibs/fess/es/exentity/RequestHeader.java

...java/org/codelibs/fess/es/exentity/WebAuthentication.java

...n/java/org/codelibs/fess/helper/CrawlingConfigHelper.java

src/main/java/org/codelibs/fess/helper/ViewHelper.java

src/main/webapp/WEB-INF/view/admin/webconfig/confirm.jsp