travis: Run some zdtm-s in RPC mode

travis-ci: success for tests: Add RPC testing to CI (rev2)
Acked-by: Andrey Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

scripts/travis/travis-tests

@@ -67,6 +67,10 @@ make -C test/others/exec/ run
 ip net add test
 ./test/zdtm.py run -t zdtm/static/env00 -f h --join-ns
 
+# RPC testing
+./test/zdtm.py run -t zdtm/static/env00 --rpc		# Basic
+./test/zdtm.py run -t zdtm/static/ptrace_sig -f h --rpc # Error handling (crfail test)
+
 pip install flake8
 make lint