When user deploys app as a WAR in Tomcat, unless the tomcat-jdbc.jar
is in the app package, it will be found in the parent first and then
be unable to load the Driver class.
[Fixes#56720610] [bs-316] Tomcat non-embedded cannot load SQL driver class
A side effect is that spring-boot-starter-data-jpa needs
to include an aspectjweaver depdendency. Hope that doesn't
hurt anything else.
[Fixes#56780004]
Rework main build POM to be an aggregator pom that does not inherit
from any parent. Introduce new spring-boot-dependencies module to
act as a parent for both spring-boot-starter-parent and
spring-boot-parent.
