MINOR: stats: replace the ST_* uri_auth flags with STAT_*

We used to rely on some config flags defined in uri_auth.h set during
parsing, and another set of STAT_* flags defined in stats.h set at run
time, with a somewhat gray area between the two sets. This is confusing
in the stats code as both are called "flags" in various functions and
it's quite hard to know which one describes what.

This patch cleans this up by replacing all ST_* by a newly assigned
value from the STAT_* set so that we can now use unified flags to
describe both the configuration and the current state. There is no
functional change at all.
diff --git a/include/types/stats.h b/include/types/stats.h
index b3a69c6..ee16ac7 100644
--- a/include/types/stats.h
+++ b/include/types/stats.h
@@ -29,6 +29,13 @@
 #define STAT_ADMIN      0x00000020	/* indicate a stats admin level */
 #define STAT_CHUNKED    0x00000040      /* use chunked encoding (HTTP/1.1) */
 #define STAT_JSON_SCHM  0x00000080      /* dump the json schema */
+
+#define STAT_HIDEVER    0x00000100      /* conf: do not report the version and reldate */
+#define STAT_SHNODE     0x00000200      /* conf: show node name */
+#define STAT_SHDESC     0x00000400      /* conf: show description */
+#define STAT_SHLGNDS    0x00000800      /* conf: show legends */
+#define STAT_SHOWADMIN  0x00001000      /* conf: show the admin column */
+
 #define STAT_BOUND      0x00800000	/* bound statistics to selected proxies/types/services */
 #define STAT_STARTED    0x01000000	/* some output has occurred */