test: add "runc run --no-pivot must not expose bare /proc"
test: add "runc run --no-pivot must not expose bare /proc"

For preventing regression like #2647

Signed-off-by: Akihiro Suda <10ddef0dea2a66ab193b07198faa879adcb213d8@hco.ntt.co.jp>
Signed-off-by: Aleksa Sarai <b305c9b0212d6145eea67bbffd24e29cb79c759c@cyphar.com>
Signed-off-by: Kir Kolyshkin <3a017b8ddb3f9cf3e4a59978b004111bdeb97f08@gmail.com>

kolyshkin/runc,kolyshkin/runc,opencontainers/runc,rhatdan/runc,kolyshkin/runc,xiaochenshen/runc,dqminh/runc,rhatdan/runc,rhatdan/runc,kolyshkin/runc,dqminh/runc,xiaochenshen/runc,opencontainers/runc,estesp/runc,estesp/runc,opencontainers/runc,xiaochenshen/runc,dqminh/runc,opencontainers/runc,dqminh/runc,rhatdan/runc,estesp/runc