THRIFT-5633: move xenial to old, deprecate xenial in travis build (#2690)

* move xenial to old, deprecate xenial in travis build

* add back stage of docker
diff --git a/.gitignore b/.gitignore
index d4c5dd7..232ed2c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -225,6 +225,9 @@
 /lib/haxe/test/data.tmp
 /lib/hs/dist
 /lib/java/.gradle
+/lib/java/gradle/wrapper
+/lib/java/gradlew
+/lib/java/gradlew.bat
 /lib/java/android/.gradle
 /lib/java/build
 /lib/java/out