GUACAMOLE-931: Verify that home directory is both a directory and writable for sake of FreeRDP initialization.
GUACAMOLE-931: Verify that home directory is both a directory and writable for sake of FreeRDP initialization.

mike-jumper/incubator-guacamole-server,mike-jumper/incubator-guacamole-server,glyptodon/guacamole-server,glyptodon/guacamole-server,mike-jumper/incubator-guacamole-server,apache/guacamole-server,glyptodon/guacamole-server,mike-jumper/incubator-guacamole-server,apache/guacamole-server,apache/guacamole-server