Add some ATF tests for libproc.

Differential Revision:	D710
Reviewed by:	jmmv, ngie, rpaulo
Ignore a test program which doesn't compile at the moment. It will be
addresed properly when integrating the DTrace tests with Kyua.
Polish INQUIRY command fields validation.
Report proper errors codes for unsupported SERVICE ACTION values.
Don't report unsupported FUA_NV bit set in READ/WRITE commands as error.

While this bit is obsolete in SBC-3, SBC-2 allowed to silently ignore it.
svn revisions r269964 and r269963 seemed to have impaired small memory
footprint systems(32M/64M) and didn't leave enough free memory to load modules
when it was setting up page tables that for sizes that are never used on
these smallish boards.

Set kmem_zmax to PAGE_SIZE on these smaller systems (< 128M) to keep this
from happening. Verified on mips32 h/w.

PR:             193465
Submitted by:   delphij
Reviewed by:    adrian