install-dependencies.sh: add maven and ant
install-dependencies.sh: add maven and ant

Add tools needed to build scylla-jmx and scylla-tools-java. While
not requirements of this repository, it's nicer if a single setup
can be used to build and run everything.

We also install pystache as it's used by packaging scripts.

scylladb/scylla,scylladb/scylla,scylladb/scylla,avikivity/scylla,avikivity/scylla,avikivity/scylla,scylladb/scylla