pkg: better FreeBSD repo override

.gitignore

 /src/etc/pkg.conf
-/src/etc/pkg/**
+/src/etc/pkg/OPNsense.conf
 /src/etc/ssh/**
 /src/etc/php.ini
 /src/lib/**

pkg/+POST_INSTALL

@@ -7,9 +7,6 @@ rm -f /etc/shells.bak
 echo "Registering root shell"
 pw usermod -n root -s /usr/local/etc/rc.initial
 
-echo "Disabling FreeBSD mirror"
-sed -i "" -e "s/^  enabled: yes$/  enabled: no/" /etc/pkg/FreeBSD.conf
-
 echo "Hooking into /etc/rc"
 cp /etc/rc /etc/rc.bak
 cat > /etc/rc <<EOF

pkg/+PRE_DEINSTALL

@@ -11,8 +11,5 @@ cp /etc/rc /etc/rc.bak
 tail -n +5 /etc/rc.bak > /etc/rc
 rm -f /etc/rc.bak
 
-echo "Enabling FreeBSD mirror"
-sed -i "" -e "s/^  enabled: no$/  enabled: yes/" /etc/pkg/FreeBSD.conf
-
 echo "Removing OPNsense version"
 rm -f /usr/local/opnsense/version/opnsense

src/etc/pkg/repos/FreeBSD.conf

+FreeBSD: { enabled: no }