JBIDE-8428 Content assist inside #{} in text element of xhtml shows JSF tags as proposals

The issue is fixed. All the Non-EL proposals are filtered out from the proposal list when the Content Assist
is invoked from the position inside EL (#{...}).
JUnit Test org.jboss.tools.jsf.jsp.ca.test.CAELNoTagProposalsInELTest

	modified:   cdi/plugins/org.jboss.tools.cdi.seam.core/src/org/jboss/tools/cdi/seam/core/international/el/CDIInternationalMessagesELResolver.java
	modified:   jsf/plugins/org.jboss.tools.jsf/src/org/jboss/tools/jsf/model/JSF2CCAttrsELCompletionEngine.java
	new file:   jsf/tests/org.jboss.tools.jsf.ui.test/src/org/jboss/tools/jsf/jsp/ca/test/CAELNoTagProposalsInELTest.java
	modified:   jsf/tests/org.jboss.tools.jsf.ui.test/src/org/jboss/tools/jsf/ui/test/JsfUiAllTests.java