http.test: Use JUnit 3 test runner

JGit relies on JUnit 3, not JUnit 4.

Change-Id: Ic5a0ae1564d7744c203321857fc603e7008dbf13
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

org.eclipse.jgit.http.test/org.eclipse.jgit.http--All-Tests.launch

@@ -9,7 +9,7 @@
 <stringAttribute key="org.eclipse.jdt.junit.CONTAINER" value="=org.eclipse.jgit.http.test"/>
 <booleanAttribute key="org.eclipse.jdt.junit.KEEPRUNNING_ATTR" value="false"/>
 <stringAttribute key="org.eclipse.jdt.junit.TESTNAME" value=""/>
-<stringAttribute key="org.eclipse.jdt.junit.TEST_KIND" value="org.eclipse.jdt.junit.loader.junit4"/>
+<stringAttribute key="org.eclipse.jdt.junit.TEST_KIND" value="org.eclipse.jdt.junit.loader.junit3"/>
 <stringAttribute key="org.eclipse.jdt.launching.MAIN_TYPE" value=""/>
 <stringAttribute key="org.eclipse.jdt.launching.PROJECT_ATTR" value="org.eclipse.jgit.http.test"/>
 </launchConfiguration>