vcsim: Improve sim for pub/sub content libs

This patch greatly improves the experience when simulating subscribed
content libraries. The libraries now more accurately simulate syncing,
as well as maintain actual copies of the published items instead of
referencing the original items. This means the subscribed items will
have unique item IDs as they do in the real system.

Signed-off-by: akutz <[email protected]>

Author: akutz

govc/test/library.bats

@@ -223,7 +223,7 @@ load test_helper
   run govc library.import -pull -c fake -a MD5 -n invalid-md5 my-content "https://$(govc env GOVC_URL)/folder/$TTYLINUX_NAME.ova"
   assert_failure # invalid checksum
 
-  sum=$(md5sum "$GOVC_IMAGES/$TTYLINUX_NAME.ovf" | awk '{print $1}')
+  sum=$(md5sum "$GOVC_IMAGES/$TTYLINUX_NAME.ova" | awk '{print $1}')
   run govc library.import -pull -c "$sum" -a MD5 -n ttylinux-unpacked my-content "https://$(govc env GOVC_URL)/folder/$TTYLINUX_NAME.ova"
   assert_success
 
@@ -668,7 +668,14 @@ EOF
   run govc library.sync subscribed-content/ttylinux-latest
   assert_success
 
-  # assert cached is false after item sync
+  # assert cached is false after item sync for ondemand library sans -f=true (force)
+  cached=$(govc library.info subscribed-content/ttylinux-latest | grep Cached: | awk '{print $2}')
+  assert_equal "false" "$cached"
+
+  run govc library.sync -f=true subscribed-content/ttylinux-latest
+  assert_success
+
+  # assert cached is true after item sync with -f=true (force)
   cached=$(govc library.info subscribed-content/ttylinux-latest | grep Cached: | awk '{print $2}')
   assert_equal "true" "$cached"