[O2-3074] Reduce rcvBufSize of input proxies to 1 (#1358)

It turns out that this setting is per-connection, thus each publisher gets their own buffer of size rcvBufSize.
This commit might not be enough to fix the situation at P2, because keeping one message per each of 250 EPNs will still require too much memory.
Also, additional messages might hide in system buffers.

Author: knopers8

Framework/src/InfrastructureGenerator.cxx

@@ -385,7 +385,7 @@ void InfrastructureGenerator::generateDataSamplingPolicyRemoteProxyConnect(frame
   const std::string& proxyName = channelName; // channel name has to match proxy name
 
   std::string channelConfig = "name=" + channelName + ",type=sub,method=connect,address=tcp://" +
-                              localMachine + ":" + localPort + ",rateLogging=60,transport=zeromq,rcvBufSize=32";
+                              localMachine + ":" + localPort + ",rateLogging=60,transport=zeromq,rcvBufSize=1";
 
   workflow.emplace_back(specifyExternalFairMQDeviceProxy(
     proxyName.c_str(),
@@ -428,7 +428,7 @@ void InfrastructureGenerator::generateDataSamplingPolicyRemoteProxyBind(framewor
   std::string channelName = policyName;
   const std::string& proxyName = channelName; // channel name has to match proxy name
 
-  std::string channelConfig = "name=" + channelName + ",type=sub,method=bind,address=tcp://*:" + remotePort + ",rateLogging=60,transport=zeromq,rcvBufSize=32";
+  std::string channelConfig = "name=" + channelName + ",type=sub,method=bind,address=tcp://*:" + remotePort + ",rateLogging=60,transport=zeromq,rcvBufSize=1";
 
   workflow.emplace_back(specifyExternalFairMQDeviceProxy(
     proxyName.c_str(),
@@ -471,7 +471,7 @@ void InfrastructureGenerator::generateLocalTaskRemoteProxy(framework::WorkflowSp
   }
 
   std::string channelConfig = "name=" + channelName + ",type=sub,method=bind,address=tcp://*:" + remotePort +
-                              ",rateLogging=60,transport=zeromq,rcvBufSize=32";
+                              ",rateLogging=60,transport=zeromq,rcvBufSize=1";
 
   workflow.emplace_back(specifyExternalFairMQDeviceProxy(
     proxyName.c_str(),