hoist kernel cmdline into moby.yaml

Signed-off-by: Tycho Andersen <tycho@docker.com>

tools/mkimage-iso-bios/Dockerfile

@@ -10,4 +10,4 @@ RUN \
 
 COPY . .
 
-CMD [ "/make-iso" ]
+ENTRYPOINT [ "/make-iso" ]

tools/mkimage-iso-bios/make-iso

@@ -14,6 +14,7 @@ cd /tmp/iso
 
 INITRD="$(find . -name '*.img')"
 KERNEL="$(find . -name vmlinuz64 -or -name bzImage)"
+CMDLINE="$*"
 
 [ "$KERNEL" = "vmlinuz64" ] || mv "$KERNEL" vmlinuz64
 [ "$INITRD" = "initrd.img" ] || mv "$INITRD" initrd.img
@@ -29,7 +30,7 @@ CFG="DEFAULT linux
 LABEL linux
     KERNEL /vmlinuz64
     INITRD /initrd.img
-    APPEND earlyprintk=serial console=ttyS0 console=tty1 $*
+    APPEND ${CMDLINE}
 "
 
 printf "$CFG" > isolinux/isolinux.cfg