Revert "[ENTESB-2380] Fix problem with the maven download proxy servlet when downloading big files (the connection may be closed by jetty before the whole file has been sent)."

This reverts commit 0c14f10fdb5f7c2fee5d722293312a0922edbb88.

Conflicts:
	fabric/fabric-maven-proxy/src/main/java/io/fabric8/maven/proxy/impl/MavenDownloadProxyServlet.java
Added missing imports for fabric-maven bundle