[bs-19] Medley of changes supporting integration apps

* Use file adapters in sample instead of internal flow
* Add Exception to signature of CommandLineRunner for
implementation convenience
* Updates for Security snapshots

spring-bootstrap-cli/src/main/scripts/spring

@@ -57,7 +57,7 @@ if [ -f build.gradle ]; then
 fi
 mkdir -p "${TARGETDIR%/}"
 
-CLASSPATH="${SPRING_BIN}":"${TARGETDIR}"
+CLASSPATH="${CLASSPATH}":"${SPRING_BIN}":"${TARGETDIR}"
 
 for f in "${SPRING_HOME}"/lib/*.jar; do
     CLASSPATH="${CLASSPATH}":$f