JUnit 3 -> 4: replace import of junit.framework.Assert with org.junit.Assert.

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk@1437579 13f79535-47bb-0310-9956-ffa450edef68
JUnit 3 -> 4: replace import of junit.framework.Assert with org.junit.Assert.

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk@1437580 13f79535-47bb-0310-9956-ffa450edef68
Organize imports.

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk@1437586 13f79535-47bb-0310-9956-ffa450edef68