use updated kernel and correct path in examples/swap.yml

for swap.sh, take any command-line options, not just those with an arg
that in turn requires a new hash on the example

Use latest 4.9.x kernel to keep in line with other examples

Replace (bash) herestring with (posix) heredoc in swap.sh, and update hash to match

Signed-off-by: Avi Deitcher <avi@deitcher.net>

examples/swap.yml

@@ -48,7 +48,7 @@ onboot:
     rootfsPropagation: shared
     command: ["/mount.sh", "/var/external"]
   - name: swap
-    image: "linuxkit/swap:edd74ce7ced2b97dba5075012f497570c5490299"
+    image: "linuxkit/swap:d089b31acad8a5f6a5f1c368ddd1dfe1d049b100"
     net: host
     pid: host
     capabilities:
@@ -57,7 +57,7 @@ onboot:
     binds:
      - /var:/var
      - /dev:/dev
-    command: ["swap.sh", "--path", "/var/external/swap", "--size","1G"]
+    command: ["/swap.sh", "--path", "/var/external/swap", "--size", "1G"]
 services:
   - name: rngd
     image: "linuxkit/rngd:3dad6dd43270fa632ac031e99d1947f20b22eec9"

pkg/swap/swap.sh

@@ -2,7 +2,7 @@
 
 set -e
 
-while [ $# -gt 1 ]; do
+while [ $# -ge 1 ]; do
 	key="$1"
 
 	case $key in
@@ -74,7 +74,9 @@ fi
 ## check each of our conditions
 for cond in $CONDITIONS; do
 	# split the condition parts
-	IFS=: read condtype arg1 arg2 arg3 arg4 <<< "$cond"
+	IFS=: read condtype arg1 arg2 arg3 arg4 <<EOF
+$cond
+EOF
 	case $condtype in
 		part)
 			partition=$arg1