Bug fixes for frontend tests.

Change-Id: I57ba84c134e45f0e15486284161f181bae145f51

Conflicts:
	meteor/meteor-webfrontend/src/main/java/eu/stratosphere/meteor/client/common/FileSystemUtility.java
	meteor/meteor-webfrontend/src/main/java/eu/stratosphere/meteor/client/common/MeteorContextHandler.java
	meteor/meteor-webfrontend/src/test/java/eu/stratosphere/meteor/client/ClientFrontendTest.java
	meteor/meteor-webfrontend/src/test/java/eu/stratosphere/meteor/client/WebFrontendTest.java
	meteor/meteor-webfrontend/src/test/java/eu/stratosphere/meteor/client/common/MeteorContextHandlerTest.java
	meteor/meteor-webfrontend/src/test/java/eu/stratosphere/meteor/client/util/LocalTestsFileSystem.java
	meteor/meteor-webfrontend/src/test/java/eu/stratosphere/meteor/client/web/AnalysisServletTest.java
	meteor/meteor-webfrontend/src/test/java/eu/stratosphere/meteor/client/web/ErrorServletTest.java
	meteor/meteor-webfrontend/src/test/java/eu/stratosphere/meteor/client/web/OtherServletTest.java
	meteor/meteor-webfrontend/src/test/java/eu/stratosphere/meteor/client/web/RuntimeStateServletTest.java
	stratosphere-dist/src/main/assemblies/bin.xml
	stratosphere-dist/src/main/assemblies/src.xml