MFC r262781,r263336:
r262781 (by pho):
Preserve naming consistency for test cases.
Pointed out by: jmmv
Sponsored by: EMC / Isilon storage division
r263336 (by pho):
Added sysctl kern.maxfiles increase test, do not use /etc/passwd for tests
and use volatile sig_atomic_t for signal handler variable.
Reviewed by: asomers (previous version)
Sponsored by: EMC / Isilon storage division