MFstable/11 r304949,r305226:

MFstable/11 r304949,r305226:

r304949:

MFC r303830,r304693,r304694,r304698:

r303830:

Remove vestigal references to __alpha__

Replace alpha reference in getconf(1) with amd64 [*]

PR:	 	211300 [*]

r304693:

Clean up trailing whitespace

r304694:

Add `MIN_HOLE_SIZE` pathconf(2) support to getconf

This allows shell programs to programmatically determine whether
or not a filesystem supports sparse files

r304698:

Add support for _PC_ACL_NFS4 as TRUSTEDBSD_ACL_NFS4

The TRUSTEDBSD prefix was chosen for consistency with the other
related `_PC_ACL*` prefixed variables.

r305226:

MFC r304809:

Add non-TRUSTEDBSD prefixed knobs for the _PC_ACL* and {CAP,INF,MAC}_PRESENT knobs

It's not necessarily intuitive that the variables to query contain TRUSTEDBSD
in the prefix. Add non-TRUSTEDBSD prefixed knobs for querying things like
"_PC_ACL_NFS4".

Relnotes:	yes