Logging behaviour can be overridden by the {PMG,PVE}_LOG environment
variable.
This commit also disables styled output and timestamps in log messages,
since we usually log to the journal anyway. The log output is configured
to match with other log messages in task logs.
Signed-off-by: Lukas Wagner <l.wagner@proxmox.com>
This commit sets up logging by hooking into module loading/bootstraping
process to call a new `init` function exported by the `Proxmox::Lib::{PVE,PMG}`
module, which initializes `env_logger` with its default settings.
This allows us to use `log::*` macros from Rust code.
Signed-off-by: Lukas Wagner <l.wagner@proxmox.com>
