GUACAMOLE-197: Fix pom.xml build to exclude signatures for BouncyCastle.
GUACAMOLE-197: Fix pom.xml build to exclude signatures for BouncyCastle.

jmuehlner/incubator-guacamole-client,mike-jumper/incubator-guacamole-client,necouchman/incubator-guacamole-client,necouchman/incubator-guacamole-client,mike-jumper/incubator-guacamole-client,mike-jumper/incubator-guacamole-client,glyptodon/guacamole-client,glyptodon/guacamole-client,glyptodon/guacamole-client,jmuehlner/incubator-guacamole-client,jmuehlner/incubator-guacamole-client,jmuehlner/incubator-guacamole-client,glyptodon/guacamole-client,necouchman/incubator-guacamole-client,necouchman/incubator-guacamole-client,glyptodon/guacamole-client,mike-jumper/incubator-guacamole-client