[BZ 1084890] modify CLI and Agent text to reflect update information if available.

(cherry picked from commit 820a4be337173e871787d8cdd0424ab84101a949)
Signed-off-by: Jirka Kremser <jkremser@redhat.com>

Conflicts:
	modules/enterprise/remoting/cli/src/main/java/org/rhq/enterprise/client/commands/LoginCommand.java