fix #1143 add virtual_host field to fess index

src/main/config/es/fess_config.json

src/main/java/org/codelibs/fess/Constants.java

.../fess/app/web/admin/dataconfig/AdminDataconfigAction.java

...rg/codelibs/fess/app/web/admin/dataconfig/CreateForm.java

.../fess/app/web/admin/fileconfig/AdminFileconfigAction.java

...rg/codelibs/fess/app/web/admin/fileconfig/CreateForm.java

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

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

...fess/crawler/transformer/AbstractFessFileTransformer.java

...delibs/fess/crawler/transformer/FessXpathTransformer.java

...va/org/codelibs/fess/es/config/bsbhv/BsDataConfigBhv.java

...va/org/codelibs/fess/es/config/bsbhv/BsFileConfigBhv.java

...ava/org/codelibs/fess/es/config/bsbhv/BsWebConfigBhv.java

...va/org/codelibs/fess/es/config/bsentity/BsDataConfig.java

...va/org/codelibs/fess/es/config/bsentity/BsFileConfig.java

...ava/org/codelibs/fess/es/config/bsentity/BsWebConfig.java

...odelibs/fess/es/config/bsentity/dbmeta/DataConfigDbm.java

...odelibs/fess/es/config/bsentity/dbmeta/FileConfigDbm.java

...codelibs/fess/es/config/bsentity/dbmeta/WebConfigDbm.java

.../org/codelibs/fess/es/config/cbean/bs/BsDataConfigCB.java