tests: add whereis(1) check

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
dmesg: parse level when --color is used

When user runs with --color it should not need to be combined with
filtering per level or facility, or decoding.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
tests: add ipcmk(1) and ipcrm(1) checks

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
Signed-off-by: Karel Zak <kzak@redhat.com>
tests: sort commands strings

The list is starting to be long enough that making any order to it seems
like right thing to do.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>