test/other: add a test to check the --shell-job option

This test creates a pty pair, creates a test process and sets a slave
pty as control terminal for it.

Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

scripts/travis/travis-tests

@@ -107,6 +107,7 @@ bash ./test/jenkins/criu-inhfd.sh
 make -C test/others/mnt-ext-dev/ run
 #make -C test/others/exec/ run
 make -C test/others/make/ run CC="$CC"
+make -C test/others/shell-job/ run
 
 ./test/zdtm.py run -t zdtm/static/env00 --sibling
 
@@ -127,6 +128,8 @@ ip net add test
 
 ./test/zdtm.py run --empty-ns -T zdtm/static/socket-tcp*-local --iter 2
 
+make -C test/others/shell-job
+
 pip install flake8
 make lint