Install a kyua.conf based on the one in devel/kyua.

The kyua.conf from examples doesn't match the expected config and
contains a lot of undesirable entries such as setting the architecture
to amd64 explicitly.

Reported by:	arichardson (missing config)
Reviewed by:	emaste
Obtained from:	CheriBSD
Differential Revision:	https://reviews.freebsd.org/D24267

usr.bin/kyua/Makefile

@@ -30,8 +30,11 @@ CFLAGS+=	-Wno-deprecated-declarations
 
 FILESGROUPS=	DOCS EXAMPLES MISC STORE
 
-CONFS=		kyua.conf
+# Install a minimal default config that uses the 'tests' user.
+# The examples config is not appropriate for general use.
+CONFS=		kyua.conf-default
 CONFSDIR=	${KYUA_CONFDIR}
+CONFSNAME=	kyua.conf
 
 DOCS=		AUTHORS CONTRIBUTORS LICENSE
 DOCSDIR=	${KYUA_DOCDIR}

usr.bin/kyua/kyua.conf-default

@@ -0,0 +1,14 @@
+-- $FreeBSD$
+--
+-- System-wide configuration file for kyua(1).  See kyua.conf(5) for details
+-- on the syntax.
+--
+
+syntax(2)
+
+-- User to drop privileges to when invoking kyua(1) as root and a test case
+-- requests to be run with non-root permissions.
+unprivileged_user = 'tests'
+
+-- An example to set a configuration property specific to FreeBSD.
+--test_suites.FreeBSD.fstype = 'ffs'