containers/netns tests rewritten

All original test cases in ltp/testcases/kernel/containers/netns
were removed and replaced with the new ones. The new test cases
cover all of the tests in the original code and everything else
in the original code didn't exercise new code paths in the kernel.
Mapping of old test cases to the new ones:

netns_crtchild -> netns_comm
netns_two_children_ns -> netns_comm
netns_crtchild_delchild -> netns_sysfs
netns_par_chld_ipv6, netns_par_chld_ftp -> nets_comm (netns_comm
    does not complicate it with sshd or ftp, it just tests
    communication using ping/ping6)
netns_devices, netns_devices2 -> netns_comm
netns_isolation -> netns_breakns

New testcases also use the helper tools for creating and working
with namespaces from ltp/testcases/kernel/containers/share.

Signed-off-by: Matus Marhefka <mmarhefk@redhat.com>
Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
45 files changed