Move all status output to stdout

I've noticed a few instances of interleaved status messages in between
lines in a terminal/Writer.Print call on our build servers. Since
there's a lock protecting everything we write, I've got to assume this
is a stdout vs stderr problem. Ninja had always been outputing to
stdout, except for error messages, which are now marked with FAILED:
like failed actions.

Test: m blueprint_tools
Test: m missing
Change-Id: Idf8320d40694abf212c902c63a9703e4440ffb7a