CDAP-4444 Make xmllint dependency optional
CDAP-4444 Make xmllint dependency optional

hsaputra/cdap,hsaputra/cdap,chtyim/cdap,hsaputra/cdap,caskdata/cdap,chtyim/cdap,chtyim/cdap,hsaputra/cdap,hsaputra/cdap,caskdata/cdap,chtyim/cdap,chtyim/cdap,caskdata/cdap,chtyim/cdap,caskdata/cdap,caskdata/cdap,caskdata/cdap