Revert "[KARAF-979] Secure shell commands"

This reverts commit 2c890746c89b5328d4b5bdf7ee220c011a95be8f.

Conflicts:
	jaas/authz/src/main/java/org/apache/karaf/jaas/authz/impl/AuthorizationServiceImpl.java

git-svn-id: https://svn.apache.org/repos/asf/karaf/branches/karaf-2.3.x@1436250 13f79535-47bb-0310-9956-ffa450edef68