[pulseaudio-discuss] make pacmd less chatty, take 2

[Peter Meerwald]

I got annoyed by the extra output (welcome message, prompt) of pacmd
when using the program for scripted testing.

This patch series changes the default behavour of the daemon cli to
non-interactive mode (i.e. no welcome message, no prompt). Interactive
mode can be requested by sending "hello" as the first command.

pacmd tried to figure out if interactive (connected to a terminal) 
or non-interactive mode is sensible and sends "hello" if needed.

Thanks to everybody for discussion!