CPPLINT: remove legal/copyright rule

CPPLINT.cfg

@@ -4,20 +4,20 @@
 #   { should almost always be at the end of the previous line
 #
 #   Allow:
-#     bool SocketAPM::pollout(uint32_t timeout_ms)
+#     bool SocketUDP::pollin(uint32_t timeout_ms)
 #     {
 # 
 #   Instead of:
-#     bool SocketAPM::pollout(uint32_t timeout_ms) {
+#     bool SocketUDP::pollin(uint32_t timeout_ms) {
 # 
 # 2. [-runtime/references]
 #   Is this a non-const reference? If so, make const or use a pointer
 # 
 #   Allow:
-#     void last_recv_address(const char *&ip_addr, uint16_t &port);
+#     void get_client_address(const char *&ip_addr, uint16_t &port);
 # 
 #   Instead of:
-#     void last_recv_address(const char *&ip_addr, uint16_t *port);
+#     void get_client_address(const char *&ip_addr, uint16_t *port);
 # 
 # 3. [-whitespace/indent]
 #     private: should be indented +1 space 
@@ -49,8 +49,12 @@
 # 7. [-build/c++11], [+build/c++14]
 #
 #   This is to allow headers not approved for C++11 such as <chrono> etc. 
-# 
+#
+# 8. [-legal/copyright]
+#     Do not require a copyright header in each file
+#
+
 set noparent
-filter=-whitespace/braces,-runtime/references,-whitespace/indent,-whitespace/blank_line,-whitespace/newline,-build/include_subdir,-build/c++11,+build/c++14
+filter=-whitespace/braces,-runtime/references,-whitespace/indent,-whitespace/blank_line,-whitespace/newline,-build/include_subdir,-build/c++11,+build/c++14,-legal/copyright
 linelength=80
 root=include