MT#55295 Use '/' instead of '_' as a delimiter

In the output it was look like:
columns/provisioning/voip_subscribers_pbx_hunt_policy/column_type

So it's hard to understand where is table name (voip_subscribers)
and where is column name (pbx_hunt_policy).

Use '/' so it will look readable.

Change-Id: I2e7ba54ab6a12b3cfc763964ac79feb7a057d63a

helper/compare_dbs.pl

@@ -63,7 +63,7 @@ SELECT
   c.CHARACTER_SET_NAME,
   c.COLLATION_NAME,
   c.ORDINAL_POSITION,
-  CONCAT(c.TABLE_NAME, '_', c.COLUMN_NAME) AS key_col
+  CONCAT(c.TABLE_NAME, '/', c.COLUMN_NAME) AS key_col
 FROM information_schema.COLUMNS c
   INNER JOIN information_schema.TABLES t
     ON c.TABLE_NAME = t.TABLE_NAME
@@ -85,7 +85,7 @@ SELECT
   SUB_PART,
   NULLABLE,
   INDEX_TYPE,
-  CONCAT(TABLE_NAME, '_', INDEX_NAME, '_',  SEQ_IN_INDEX) AS key_col
+  CONCAT(TABLE_NAME, '/', INDEX_NAME, '/',  SEQ_IN_INDEX) AS key_col
 FROM information_schema.STATISTICS
 WHERE TABLE_SCHEMA = DATABASE()
 ORDER BY TABLE_NAME, INDEX_NAME, COLUMN_NAME
@@ -101,7 +101,8 @@ SELECT
   rc.DELETE_RULE,
   cu.REFERENCED_COLUMN_NAME,
   cu.COLUMN_NAME,
-  CONCAT(rc.CONSTRAINT_NAME, '_', rc.TABLE_NAME, '_',  cu.COLUMN_NAME, '_', rc.REFERENCED_TABLE_NAME, '_',
+  CONCAT(rc.CONSTRAINT_NAME, '/', rc.TABLE_NAME, '/',
+    cu.COLUMN_NAME, '/', rc.REFERENCED_TABLE_NAME, '/',
     cu.REFERENCED_COLUMN_NAME) AS key_col
 FROM information_schema.REFERENTIAL_CONSTRAINTS rc
   LEFT JOIN information_schema.KEY_COLUMN_USAGE cu
@@ -120,7 +121,7 @@ SELECT
   ACTION_TIMING,
   EVENT_OBJECT_SCHEMA,
   EVENT_OBJECT_TABLE,
-  CONCAT(TRIGGER_NAME, '_', EVENT_OBJECT_TABLE) AS key_col
+  CONCAT(TRIGGER_NAME, '/', EVENT_OBJECT_TABLE) AS key_col
 FROM information_schema.TRIGGERS
 WHERE TRIGGER_SCHEMA = DATABASE()
 ORDER BY EVENT_OBJECT_TABLE, TRIGGER_NAME