tools/runqlat.py:get the pid namespace by following task_active_pid_ns()
tools/runqlat.py:get the pid namespace by following task_active_pid_ns()

Simliar fix as commit bced75aae53c22524fd335b04a005ce60384b8a8

Signed-off-by: 38e7f99b4fd4e60dfb055aeb14e105f9cd464790@hotmail.com

iovisor/bcc,brendangregg/bcc,iovisor/bcc,iovisor/bcc,brendangregg/bcc,iovisor/bcc,iovisor/bcc,brendangregg/bcc,brendangregg/bcc,brendangregg/bcc