run_ptest.sh: Fix command not found when ssh
run_ptest.sh: Fix command not found when ssh

"If command is specified, it is executed on the remote host instead of a login shell",
this makes PATH miss /sbin and /usr/sbin, then some commands cannot be found.
Fix it by running command with "/bin/sh -l".

Signed-off-by: Trung Do <64081e6b7eb2b24289b8a4e51cef9836ddf28af2@toshiba-tsdv.com>

meta-debian/meta-debian,meta-debian/meta-debian,meta-debian/meta-debian,meta-debian/meta-debian,meta-debian/meta-debian,meta-debian/meta-debian