tests: fix builds on alpine and centos

Install sudo, create test user with ID 1000, install bash,
fix pidfile creation and pidfile chmod.

v2:
 * use sleep to give the criu daemon some time to start up

Signed-off-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>