[RFC][icedtea-web] Do not allow searching of jar manifest classpath if jnlp_href is being used

[Danesh Dadachanji]

With the many improvements in the test engine, I have been able to write up the tests for this finally! Many thanks to Jiri for all the 
features added to the test engine!

ChangeLog:
+2012-07-09  Danesh Dadachanji  <ddadacha at redhat.com>
+
+	Classpaths in jars' manifests are only considered when the applet is run
+	without using jnlp_href and a JNLP file.
+	* netx/net/sourceforge/jnlp/runtime/JNLPClassLoader.java (activateJars):
+	Add conditional check for use of jnlp_href.
+	* tests/reproducers/signed/Classpath.Manifest.Test.Helper/srcs/CheckForClasspath.java:
+	Applet whose jar is stored in a subdir under the test engine server.
+	* tests/reproducers/signed/ClasspathManifestTest/resources/ClasspathManifestAppletTest.html:
+	* tests/reproducers/signed/ClasspathManifestTest/resources/ClasspathManifestAppletTest.jnlp:
+	* tests/reproducers/signed/ClasspathManifestTest/resources/ClasspathManifestApplicationTest.jnlp:
+	* tests/reproducers/signed/ClasspathManifestTest/resources/ClasspathManifestJNLPHrefTest.html:
+	* tests/reproducers/signed/ClasspathManifestTest/srcs/ClasspathManifest.java:
+	* tests/reproducers/signed/ClasspathManifestTest/srcs/META-INF/MANIFEST.MF:
+	* tests/reproducers/signed/ClasspathManifestTest/testcases/ClasspathManifestTest.java:
+	Test if manifest entry is searched for classpath only when in the plugin
+	is run without using jnlp_href.
+

I've updated my changeset (first attachment), I had forgotten a '!' in the if-statement there. Is this one okay for HEAD and to backport?

The above scenarios that are supposed to fail (applets run by some JNLP file) do not fail in HEAD when run locally. I ran into some 
issues with running the above tests locally though, the X11 display is not found. I've attached a second patch that will add said 
tests. It's missing one, the passing browser test.

Cheers,
Danesh
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