MFC r315032-r315036, r315039, r315041

MFC r315032-r315036, r315039, r315041

r315032:
Increase WARNS for iconv tests

ATF tests have a default WARNS of 0, unlike other usermode programs.

Reviewed by:	ngie
Sponsored by:	Spectra Logic Corporation
Differential Revision:	https://reviews.freebsd.org/D9933

r315033:
Increase WARNS for nss tests

ATF tests have a default WARNS of 0, unlike other usermode programs.

Reviewed by:  ngie
Sponsored by: Spectra Logic Corporation
Differential Revision:        https://reviews.freebsd.org/D9933

r315034:
Document that the msun tests require WARNS=0

ATF tests have a default WARNS of 0, unlike other usermode programs.  This
change is technically a noop, but it documents that the msun tests don't
work with any warnings enabled, at least not on all architectures.

Reviewed by:  ngie
Sponsored by: Spectra Logic Corporation
Differential Revision:        https://reviews.freebsd.org/D9933

r315035:
Increase WARNS for libcrypt tests

ATF tests have a default WARNS of 0, unlike other usermode programs.

Reviewed by:  ngie, julian
Sponsored by: Spectra Logic Corporation
Differential Revision:        https://reviews.freebsd.org/D9933

r315036:
Increase WARNS for libmp tests

ATF tests have a default WARNS of 0, unlike other usermode programs.

Reviewed by:  ngie, julian
Sponsored by: Spectra Logic Corporation
Differential Revision:        https://reviews.freebsd.org/D9933

r315039:
Increase WARNS for libutil tests

ATF tests have a default WARNS of 0, unlike other usermode programs.

Reviewed by:  ngie, julian
Sponsored by: Spectra Logic Corporation
Differential Revision:        https://reviews.freebsd.org/D9933

r315041:
Increase WARNS for pw tests

ATF tests have a default WARNS of 0, unlike other usermode programs.

Reviewed by:  ngie, julian
Sponsored by: Spectra Logic Corporation
Differential Revision:        https://reviews.freebsd.org/D9933

git-svn-id: svn://svn.freebsd.org/base/stable/10@319252 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f