Revert "Add check before deserializing messages (sonic-net#812)" (sonic-net#819)

This reverts commit 2365fe8.

Will be creating new PR to solve issue with proper RC instead of simply dropping message.

Author: zbud-msft

common/events_common.h

@@ -258,9 +258,7 @@ struct serialization
     int
     deserialize(const string& s, Map& data)
     {
-        if (s.size() < 2) { // zmq identifying message of length 1
-            return 0;
-        }
+
         try {
             istringstream ss(s);
             boost::archive::text_iarchive iarch(ss);

tests/events_common_ut.cpp

@@ -81,20 +81,17 @@ TEST(events_common, send_recv)
     void *sock_p1 = zmq_socket (zmq_ctx, ZMQ_PAIR);
     EXPECT_EQ(0, zmq_bind (sock_p1, path));
 
-    string source("Hello"), source1, source2("#");
+    string source("Hello"), source1;
 
     map<string, string> m = {{"foo", "bar"}, {"hello", "world"}, {"good", "day"}};
-    map<string, string> m1, m2;
+    map<string, string> m1;
 
     EXPECT_EQ(0, zmq_message_send(sock_p0, source, m));
 
     EXPECT_EQ(0, zmq_message_read(sock_p1, 0, source1, m1));
 
     EXPECT_EQ(source, source1);
     EXPECT_EQ(m, m1);
-
-    EXPECT_EQ(0, deserialize(source2, m2));
-
     zmq_close(sock_p0);
     zmq_close(sock_p1);
     zmq_ctx_term(zmq_ctx);