test-010: add support for newer cpu.pressure output

test-010: add support for newer cpu.pressure output

Kernel commit 0e94682b73bf ("psi: introduce psi monitor"), adds more
information to the cgroup V2 cpu.pressure file. This patch recognizes
the additional information displayed while reading cpu.pressure file.

Older format:
-------------
cpu.pressure: some avg10=0.00 avg60=0.00 avg300=0.00 total=0

New format:
-----------
some avg10=0.00 avg60=0.00 avg300=0.00 total=0
full avg10=0.00 avg60=0.00 avg300=0.00 total=0

Fixes: https://github.com/libcgroup/libcgroup/issues/105
Reported-by: Tom Hromatka <tom.hromatka@oracle.com>
Signed-off-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>
Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>