Add support of configuration file for installation scripts.

conf/bbb.conf.sample

@@ -0,0 +1,21 @@
+#-------------------------------------------
+# Settings for BigBlueButoon Install scripts
+#-------------------------------------------
+
+# FQDN_HOSTNAME
+#
+# The full qualified histname under which bbb service
+# is available
+#
+# Defaults to full qualified hostname of the system
+#
+FQDN_HOSTNAME=""
+
+# GREENLIGTH_DIR
+#
+# Installation directory of 'greenlight'
+#
+# Defaults to: GREENLIGTH_DIR="/usr/local/greenlight"
+#
+#GREENLIGTH_DIR=""
+