MDEV-26171: wsrep_sst_receive_address does not parse IPv6 address correctly

This commit fixes problems with parsing ipv6 addresses given via
the wsrep_sst_receive_address and wsrep_node_address options.

Also, this commit removes extra lines in the configuration files
in the mtr test suites for Galera related to these parameters.

sql/wsrep_utils.h

@@ -46,6 +46,7 @@ public:
   const char* get_address() { return m_address; }
   size_t get_address_len() { return m_address_len; }
   int get_port() { return m_port; }
+  void set_port(int port) { m_port= port; }
 
 private:
   enum family {