birdc: using command output in scripts

Hello list! It is more or less useful to see 'BIRD X.X.X ready.' after cli starts. However, birdc is sometimes used in non-interactive way (like 'birdc configure' or 'birdc show route table XXXX for YYY'). Getting such string (in STDOUT, as other data) with command output is inconvenient. This behavior can be fixed with very trivial patch. Can someone consider getting it added to the tree?