treewide: Make logging variables more consistent

This aims to better group related variables and differentiate keywords
like INTERFACE_NAME into NET vs DBUS.

Tested: Ran on a machine to verify that our info log messages still look
sane in the journal.

Change-Id: Ic4d1faaaf5c432e69cacd387fa972481916b6bc8
Signed-off-by: William A. Kennington III <wak@google.com>
7 files changed