Remove _LI, _LW, _LE, _LC from i18n

Log translation is no longer used, remove translate functions

Change-Id: I910aed35ae1de39505cbadea19930a8270d95b82

octavia/i18n.py

@@ -18,13 +18,3 @@ _translators = i18n.TranslatorFactory(domain='octavia')
 
 # The primary translation function using the well-known name "_"
 _ = _translators.primary
-
-# Translators for log levels.
-#
-# The abbreviated names are meant to reflect the usual use of a short
-# name like '_'. The "L" is for "log" and the other letter comes from
-# the level.
-_LI = _translators.log_info
-_LW = _translators.log_warning
-_LE = _translators.log_error
-_LC = _translators.log_critical