Bug 1113593 - Blank space around value of rhq.server.email.smtp-host
property in rhq-server.properties is not removed and causes
java.net.UnknownHostException when starting RHQ server

Added a check to rhqctl start & install commands that prints warnings in
case it finds lines with trailing spaces in rhq-server.properties file

(cherry picked from commit 8b3c5958208ab48b9a7c63e90824aa43a8b76958)
Signed-off-by: Libor Zoubek <lzoubek@redhat.com>