fai-make-nfsroot bug

[Bill MacAllister]

Just hit this minor bug in fai-server 5.3.6.

--- /usr/sbin/fai-make-nfsroot  2018-02-02 13:06:52.000000000 +0000
+++ /var/tmp/fai-make-nfsroot   2018-02-05 20:23:41.370416545 +0000
@@ -477,7 +477,7 @@
     if [ -d $cfdir/apt/keys ]; then
         local f
         for f in `find $cfdir/apt/keys -type f -name '*.asc'`; do
-            cp $f $$NFSROOT/etc/apt/trusted.gpg.d
+           cp $f $NFSROOT/etc/apt/trusted.gpg.d
         done
     fi

Bill