implementations, convert request handlers to use new python concurrent
framework, excise GfeScript and GfeScriptExecutor from the system.
Change-Id: I801b7b9812a72fdfc72975a311d8dc3806cda152
Conflicts:
edexOsgi/com.raytheon.edex.plugin.gfe/META-INF/MANIFEST.MF
edexOsgi/com.raytheon.edex.plugin.gfe/utility/edex_static/base/gfe/isc/iscUtil.py
Former-commit-id: 37020656f1502afee59e41ed7daf16775e200cbf