Updated archive isolation tests
* Renamed Weld.COMPOSITE_ARCHIVE_ENABLEMENT_SYSTEM_PROPERTY to Weld.ARCHIVE_ISOLATION_SYSTEM_PROPERTY to make the constant name consistent with the property name
* IsolationDisabledTest corrected: it is a test base, it tested enabled (not disabled) isolation, and the system property setting didn't work, managed arquillian deployment is deployed before @BeforeClass. Corrected and moved IsolationDisabledTest to ArchiveIsolationOverrideTestBase, corrected dependent tests, created actual test for disabled archive isolation.
Add support for exclusion filters to BeansXml
+ update of IsolationDisabledTest with exclude filters
Fix, if-system-property value is optional