Tone down a log message.

Sometimes shell commands like "am" return before the framework stuff
really finishes initializing (e.g. if you give it no arguments so you
can see the usage info).  The runtime used to print the dire and
uninformative message:

  E/AndroidRuntime(): ERROR: thread attach failed

With this change it's a bit more subdued:

  I/AndroidRuntime(): NOTE: attach of thread 'Binder Thread #2' failed

Ideally it wouldn't get logged at all when it's "expected", but that
requires actual code changes.