useIP=false is ignored for host interceptor in flume 1.3.0

[Eran Kutner]

As the subject says:
I have this interceptor configured:
agent.sources.r1.interceptors.i2.type = host
agent.sources.r1.interceptors.i2.hostHeader = hostname
agent.sources.r1.interceptors.i2.useIP = false

But on flume 1.3.0 (from CDH4.2.1) the value of %{hostname} is replaced
with the IP of the server. The same configuration in flume 1.2.0 works
correctly and the %{hostname} is replaced with the hostname of the server.

-eran