rpc: add bad-blocks to flush_cache RPC

Flushes m_invalid_blocks in Blockchain.

src/rpc/core_rpc_server.cpp

@@ -3004,6 +3004,8 @@ namespace cryptonote
     RPC_TRACKER(flush_cache);
     if (req.bad_txs)
       m_core.flush_bad_txs_cache();
+    if (req.bad_blocks)
+      m_core.flush_invalid_blocks();
     res.status = CORE_RPC_STATUS_OK;
     return true;
   }

src/rpc/core_rpc_server_commands_defs.h

@@ -88,7 +88,7 @@ namespace cryptonote
 // advance which version they will stop working with
 // Don't go over 32767 for any of these
 #define CORE_RPC_VERSION_MAJOR 3
-#define CORE_RPC_VERSION_MINOR 0
+#define CORE_RPC_VERSION_MINOR 1
 #define MAKE_CORE_RPC_VERSION(major,minor) (((major)<<16)|(minor))
 #define CORE_RPC_VERSION MAKE_CORE_RPC_VERSION(CORE_RPC_VERSION_MAJOR, CORE_RPC_VERSION_MINOR)
 
@@ -2559,9 +2559,11 @@ namespace cryptonote
     struct request_t
     {
       bool bad_txs;
+      bool bad_blocks;
 
       BEGIN_KV_SERIALIZE_MAP()
         KV_SERIALIZE_OPT(bad_txs, false)
+        KV_SERIALIZE_OPT(bad_blocks, false)
       END_KV_SERIALIZE_MAP()
     };
     typedef epee::misc_utils::struct_init<request_t> request;