util: standarize output destination

util: standarize output destination

Errors used to end up either in stdout or stderr without any apparent
pattern. All errors will now end up in stderr, with stdout being used
only for actual logs (or, in case of -g, the size).

Additionally, rename the _E and _D macros to ERR and DBG respectively
since there is a convention in application code that that these are
for sending logs to dlog itself.

Change-Id: Ie53fc55d4ad47a1d7cf28278d5b5392e58d9be1e
Signed-off-by: Michal Bloch <m.bloch@samsung.com>