Switch to text access log file for Traffic Server.

Since we're now routing to APIs directly with Traffic Server, switch to
a text log, instead of a binary log for easier searching, since this log
file might be more useful for debugging now.

templates/etc/trafficserver/logging.config.mustache

@@ -2,7 +2,7 @@ extended_custom = format {
   Format = '%<chi> - %<caun> [%<cqtn>] "%<cqtx>" %<pssc> %<pscl> %<{X-Api-Umbrella-Request-ID}cqh> sssc=%<sssc> sscl=%<sscl> cqbl=%<cqbl> pqbl=%<pqbl> cqhl=%<cqhl> pshl=%<pshl> pqhl=%<pqhl> sshl=%<sshl> ttms=%<ttms> stms=%<stms> phr=%<phr> cfsc=%<cfsc> pfsc=%<pfsc> crc=%<crc> chm=%<chm> cwr=%<cwr> cwtr=%<cwtr>'
 }
 
-log.binary {
+log.ascii {
   Format = extended_custom,
-  Filename = 'access.blog'
+  Filename = 'access.log'
 }