ltp: add runtime test

ltp: add runtime test

This adds the framework for running ltp tests.

Here are some times:
math: 61
syscalls: 3957
dio: 18472
io: 29
mm: 551
ipc: 48
sched: 165
nptl: 46
pty: 37
containers: 52
controllers: 9625
filecaps: 27
cap_bounds: 27
fcntl-locktests: 29
connectors: 27
timers: 37
commands: 165
net.ipv6_lib: 30
input: 29
fs_perms_simple: 31
fs: 3476
fsx: 30
fs_bind: 28
fs_ext4: 28
cve: 675

Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>