User Input: No console prompt thread for Non-TTY (#869)
User Input: No console prompt thread for Non-TTY (#869)

Do not run the console prompt thread when stdin is not a TTY.  This will
prevent a thread from being created that almost immediately sleeps for a
week.
google/openhtf,jettisonjoe/openhtf,google/openhtf,jettisonjoe/openhtf,google/openhtf,google/openhtf,jettisonjoe/openhtf,jettisonjoe/openhtf