ct: add support of user namespaces
makefile: make clean should clean test/ too
libct: add libct.a in gitignore

Signed-off-by: Andrey Vagin <avagin@openvz.org>
libct: add new abstraction for processes

Signed-off-by: Andrey Vagin <avagin@openvz.org>
process: add a function to create a process descriptor

Signed-off-by: Andrey Vagin <avagin@openvz.org>
ct: all function to execute smth in CT take a process descriptor

Signed-off-by: Andrey Vagin <avagin@openvz.org>
ct: use propertios from a process descriptor

Signed-off-by: Andrey Vagin <avagin@openvz.org>
libct: remove old stuff

Signed-off-by: Andrey Vagin <avagin@openvz.org>
tests: update tests accoding with new changes of API
tests: check capabilities and process ids

Signed-off-by: Andrey Vagin <avagin@openvz.org>
go: add support of process descriptors

Signed-off-by: Andrey Vagin <avagin@openvz.org>
debug: logfd = 2
debug
test
libct: remove unused server_sk
test: veth