Update documentation / quickstarts to use AMQ 6.3 image instead of the deprecated AMQ 6.2 image

As the AMQ 6.2 image is about to be deprecated, we should update all references to it (from documentation and quickstarts) to point to AMQ 6.3 instead.

especially

https://access.redhat.com/documentation/en-us/red_hat_jboss_fuse/6.3/html/fuse_integration_services_2.0_for_openshift/camel-amq

and AMQ-using templates descriptions (mentioning "amq62-basic" ):

https://github.com/jboss-fuse/application-templates/blob/fis-2.0.x.redhat/quickstarts/spring-boot-camel-amq-template.json
https://github.com/jboss-fuse/application-templates/blob/fis-2.0.x.redhat/quickstarts/karaf2-camel-amq-template.json

and quickstart readmes

https://github.com/fabric8-quickstarts/karaf2-camel-amq
https://github.com/fabric8-quickstarts/spring-boot-camel-amq

and quickstart arquillian tests

https://github.com/fabric8-quickstarts/spring-boot-camel-amq/blob/fis-2.0.x.redhat/src/test/resources/amq.json (see also OSFUSE-634)