pkg.conf: add valid configurations for kmods for all branches

MFC After:	1 week
Reviewed by:	cperciva
Differential Revision: 	https://reviews.freebsd.org/D50668

usr.sbin/pkg/FreeBSD.conf.latest

@@ -15,7 +15,7 @@ FreeBSD: {
   enabled: yes
 }
 FreeBSD-kmods: {
-  url: "pkg+https://pkg.FreeBSD.org/${ABI}/kmods_latest_${VERSION_MINOR}",
+  url: "pkg+https://pkg.FreeBSD.org/${ABI}/kmods_latest",
   mirror_type: "srv",
   signature_type: "fingerprints",
   fingerprints: "/usr/share/keys/pkg",

usr.sbin/pkg/FreeBSD.conf.quarterly

@@ -15,7 +15,7 @@ FreeBSD: {
   enabled: yes
 }
 FreeBSD-kmods: {
-  url: "pkg+https://pkg.FreeBSD.org/${ABI}/kmods_quarterly_${VERSION_MINOR}",
+  url: "pkg+https://pkg.FreeBSD.org/${ABI}/kmods_quarterly",
   mirror_type: "srv",
   signature_type: "fingerprints",
   fingerprints: "/usr/share/keys/pkg",

usr.sbin/pkg/FreeBSD.conf.quarterly-release

@@ -0,0 +1,23 @@
+#
+# To disable a repository, instead of modifying or removing this file,
+# create a /usr/local/etc/pkg/repos/FreeBSD.conf file, e.g.:
+#
+#   mkdir -p /usr/local/etc/pkg/repos
+#   echo "FreeBSD: { enabled: no }" > /usr/local/etc/pkg/repos/FreeBSD.conf
+#   echo "FreeBSD-kmods: { enabled: no }" >> /usr/local/etc/pkg/repos/FreeBSD.conf
+#
+
+FreeBSD: {
+  url: "pkg+https://pkg.FreeBSD.org/${ABI}/quarterly",
+  mirror_type: "srv",
+  signature_type: "fingerprints",
+  fingerprints: "/usr/share/keys/pkg",
+  enabled: yes
+}
+FreeBSD-kmods: {
+  url: "pkg+https://pkg.FreeBSD.org/${ABI}/kmods_quarterly_${VERSION_MINOR}",
+  mirror_type: "srv",
+  signature_type: "fingerprints",
+  fingerprints: "/usr/share/keys/pkg",
+  enabled: yes
+}

usr.sbin/pkg/Makefile

@@ -6,7 +6,7 @@ BRANCH?=	${_BRANCH}
 PKGCONFBRANCH?=	latest
 .else
 . if ${BRANCH:MBETA*} || ${BRANCH:MRC*} || ${BRANCH:MRELEASE*}
-PKGCONFBRANCH?=	quarterly
+PKGCONFBRANCH?=	quarterly-release
 . else
 .  if ${MACHINE} != "amd64" && ${MACHINE} != "i386" && ${MACHINE} != "arm64"
 PKGCONFBRANCH?=	quarterly