Allow configuration of log level via helm

[cbgbt]

Issue number:
Closes #509

Description of changes:
This change allows users to apply tracing filter directives to any of the brupop components.

Filter directives at their most simple act like log-levels; however, you can also apply more complex filters

Testing done:
Ran a brupop cluster with various tracing directives, e.g.

controller_tracing_filter: "hyper=info,debug"
agent_tracing_filter: "warn"
apiserver_tracing_filter: "h2=info,debug"

controller_tracing_filter: "debug"
agent_tracing_filter: "debug"
apiserver_tracing_filter: "debug"

And noted that the log filtering appeared to be correct.

Terms of contribution:

By submitting this pull request, I agree that this contribution is dual-licensed under the terms of both the Apache License, version 2.0, and the MIT license.