doc(log): Make err/cri/wrn tags consistent

Tags in error messages were inconsistent.  They are now
all one of: ERR, CRI, or WRN to make it easier to search
stderr.

Signed-off-by: E. Scott Daniels <daniels@research.att.com>
Change-Id: I83a1d95e29296eadb3749885e1ac7f6ff0da7826
8 files changed