tests/acceptance: Add new test cases in linux_ssh_mips_malta.py

Add 15 new tests cases. They all rely on simple commands used for
detecting hardware configuration information.

Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Message-Id: <1564760158-27536-3-git-send-email-aleksandar.markovic@rt-rk.com>
Reviewed-by: Cleber Rosa <crosa@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>