execin should honour rlimit of the container

Docker-DCO-1.1-Signed-off-by: Daniel, Dao Quang Minh <dqminh89@gmail.com> (github: dqminh)
refactor common container setup out of execin tests

Docker-DCO-1.1-Signed-off-by: Daniel, Dao Quang Minh <dqminh89@gmail.com> (github: dqminh)
cgroup: add support to set MemorySwap

Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
user: MAINTAINERS: add cyphar as a maintainer

This patch adds Aleksa Sarai to the maintainer list for libcontainer's
user API.

Signed-off-by: Aleksa Sarai <cyphar@cyphar.com> (github: cyphar)
Merge pull request #288 from hqhq/hq_add_memory_swap

cgroup: add support to set MemorySwap
Merge pull request #289 from dqminh/execin-rlimit

Set rlimit for execin process
cgroups: add failcnt test

It was missed in the first place.

Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
Merge pull request #295 from hqhq/hq_fix_memory_test

cgroups: add failcnt test
Merge pull request #294 from cyphar/user-add-cyphar-maintainer

user: MAINTAINERS: add cyphar (myself) as a maintainer