Add `java` mock scripts to avoid running a JVM during tests

The script simply prints out each argument in an unambigous form on a single
line and handles to the `--version` option.

For windows, add `java.cmd` script which simply calls the former `java` script.

integration-test/bin/java

@@ -0,0 +1,9 @@
+#!/usr/bin/env python
+
+import sys
+
+if '--version' in sys.argv or '-version' in sys.argv:
+    print 'openjdk version "1.8.0_212"'
+else:
+    for arg in sys.argv[1:]:
+        print(repr(arg)[1:-1])

integration-test/bin/java.cmd

@@ -0,0 +1 @@
+@python "%~dp0%~n0" %*