Release 7.0.1: Add configuration option to enable AJP based communication for Grizzly instead of HTTP

[Guest]

Some customers might prefer to keep their AJP based setups (mod_proxy_ajp) to switching to HTTP based setups (mod_proxy_http). Another configuration property in grizzly.properties makes it possible to toggle AJP communication.

### Protocol
################################################## ##############################

# Grizzly is able to communicate via AJP besides its default prototcol HTTP.
# Do you want to use AJP instead of HTTP?
# Default value: false
com.openexchange.http.grizzly.hasAJPEnabled=false