Support logging config for each component

[arnaudsjs]

This ticket should make sure that a global config option exists and is supported for each component.

Example configuration file from design document:

[logging]
server=/etc/inmanta/logging/server.yml
scheduler=/etc/inmanta/logging/scheduler.yml
compiler_service=/etc/inmanta/logging/compiler_service.yml.tmpl
agent=/etc/inmanta/logging/agent.yml.tmpl
cli=/etc/inmanta/logging/cli.yml

Tasks:

• Add config options.
• Ensure correct handling of precedence rules between config provided on the cli (--logging-config) and global config options. If none is provided fall back to previous implementation.
• Ensure correct handling of template files.
• Remove log shipping from executor to agent/scheduler.
• Ignore old logging config options when a logging config file is provided on the CLI or in the global config.
• Make sure that default logging config for each component is included in the inmanta-core python package. This config should be used by default if no other logging config was provided.