Monolithic mode for the docker image

[murrant]

Simply set MONOLITHIC=1

This will include all sidecars in one container.

• dispatcher
• syslong-ng
• snmptrapd
• rrdcached * new

While the sidecars are great for highly orchestrated setups, the standalone mode is more ideal for simple single node setups (such as home networks).

Additional docker-compose examples. Remove obsolete memcached references.