content-sqlite: set quick_check pragma

Problem: if database is corrupt, content-sqlite may load successfully
then fail a load/store request, resulting in secondary failures
such as a KVS module load failure, and content-flush hang in rc3.

Add the sqlite "quick_check" pragma which detects a corrupt database
during module initialization.

Fixes #4338

Author: garlick

src/modules/content-sqlite/content-sqlite.c

@@ -640,6 +640,14 @@ static int content_sqlite_opendb (struct content_sqlite *ctx, bool truncate)
         log_sqlite_error (ctx, "setting sqlite 'locking_mode' pragma");
         goto error;
     }
+    if (sqlite3_exec (ctx->db,
+                      "PRAGMA quick_check",
+                      NULL,
+                      NULL,
+                      NULL) != SQLITE_OK) {
+        log_sqlite_error (ctx, "setting sqlite 'quick_check' pragma");
+        goto error;
+    }
     if (sqlite3_exec (ctx->db,
                       sql_create_table,
                       NULL,