[MINOR] private key name (#563)

node-priveate-key is a path and not a key.  The everything_config.toml
should blatently look like a valid path

The old value was a valid path, but gave the wrong impression.

pantheon/src/test/resources/everything_config.toml

@@ -11,7 +11,7 @@
 # Node Information
 datadir="~/pantheondata"
 logging="INFO"
-node-private-key="0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef"
+node-private-key="./path/to/privateKey"
 
 # P2P network
 no-discovery=true