Update and Remove some network-cfg.json sample

Remove network-cfg
    Each app has its own way to interpret the config.
    Therefore it doesn't make sense to keep a generic one
    In long term, each app should have a json schema that explain the meaning
Remove network-cfg-fabric4x4
    It does not provide more info than 2x2
Remove network-cfg-fabric2x2-default-route and network-cfg-fabric2x2-xconnect
    Keeping features in different configs doesn't help much but make people confused
    Also it's hard to maintain so many samples
Add network-cfg-fabric-2x2-all
    Full fabric config with readme
    The html documentation is just temporary. We will have a json schema
Rename/update network-cfg-fabric-2x2-min.json
    Minimum config required by the fabric

Change-Id: I93332d8166c264b9dbb7819b90099c2f19fcf3b5
diff --git a/tools/package/config/README b/tools/package/config/README
index 970f87a..6dd04ba 100644
--- a/tools/package/config/README
+++ b/tools/package/config/README
@@ -1,2 +1,5 @@
 The onos-config command will copy files contained in this directory to ONOS
 instances according to cell definition.
+
+NOTE: Please remember to rename the network config to network-cfg.json if
+      you copy it from the samples directory
\ No newline at end of file