Make TLS logs more readable

After looking at these for I9881f2e7d51fdd9fc0f7fb3e37179aa53171b531 I
found them not as useful as they could be.

Fix the CustomLog command, that wants the logfile then the format
string (or a nickname, which the LogFormat line wasn't setting).  Use
standard micro-second timestamps, and trim the access log to have more
relevant info.

Change-Id: I9f4c8ef38ab9e08aeced7b309d4a5276de07af4b
diff --git a/lib/tls b/lib/tls
index 6a3d260..7bde5e6 100644
--- a/lib/tls
+++ b/lib/tls
@@ -533,10 +533,9 @@
         ProxyPassReverse http://$b_host:$b_port/
     </Location>
     ErrorLog $APACHE_LOG_DIR/tls-proxy_error.log
-    ErrorLogFormat "[%{u}t] [%-m:%l] [pid %P:tid %T] %7F: %E: [client\ %a] [frontend\ %A] %M% ,\ referer\ %{Referer}i"
+    ErrorLogFormat "%{cu}t [%-m:%l] [pid %P:tid %T] %7F: %E: [client\ %a] [frontend\ %A] %M% ,\ referer\ %{Referer}i"
     LogLevel info
-    CustomLog $APACHE_LOG_DIR/tls-proxy_access.log common
-    LogFormat "%v %h %l %u %t \"%r\" %>s %b"
+    CustomLog $APACHE_LOG_DIR/tls-proxy_access.log "%{%Y-%m-%d}t %{%T}t.%{msec_frac}t [%l] %a \"%r\" %>s %b"
 </VirtualHost>
 EOF
     if is_suse ; then