fix #1704 remove netbios name

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

src/main/java/org/codelibs/fess/ldap/LdapManager.java

...t/java/org/codelibs/fess/helper/PermissionHelperTest.java

src/test/java/org/codelibs/fess/helper/SystemHelperTest.java

src/test/java/org/codelibs/fess/ldap/LdapManagerTest.java