add missing libxml2-dev and libxslt-dev dependencies
add missing libxml2-dev and libxslt-dev dependencies

Signed-off-by: Orit Wasserman <1f3a53abf856ed0f6616d3d07b2f5b92f490c718@redhat.com>

timuralp/s3-tests,timuralp/s3-tests,jmunhoz/s3-tests,ceph/s3-tests,ceph/s3-tests,andrewgaul/s3-tests,robbat2/s3-tests,robbat2/s3-tests,jmunhoz/s3-tests,andrewgaul/s3-tests