fw: move version and cmd line logging to main()

Move the logging of the WA version and command line used to invoke it
from run command into main() inside entrypoint. That way, these will be
the first entries in the log file, now that early log records are no
longer lost.

wa/commands/run.py

@@ -24,7 +24,6 @@ from wa.framework import pluginloader
 from wa.framework.configuration.parsers import AgendaParser
 from wa.framework.execution import Executor
 from wa.framework.output import init_run_output
-from wa.framework.version import get_wa_version
 from wa.framework.exception import NotFoundError, ConfigError
 from wa.utils import log
 from wa.utils.types import toggle_set