Wrapper  scripts, report generation, cleanup

Add run_tests.sh to trigger testr run (similar to tempest runs)
add ant task to convert xml to html report. HTML report would be in contrail-test/report/
Attach attribute of ‘sanity’ to sanity cases
move webui cases to old folder until Ankit’s changes are ready
make scripts to be runnable from the contrail-test folder instead of scripts
no need to set pythonpath
Remove the sys.path.append inside the scripts

Usage
===========
cd to contrail-test
./run_tests.sh -s ( do run_tests.sh -h for help) -r result.xml
./run_tests.sh -t — scripts.vdns.test_vdns.TestvDNS0.test_vdns_ping_same_vn
testr run sanity
testr list-tests sanity