scripted-diff: Rename Sock::{RECV,SEND,ERR}

The `ERR` macro is defined on illumos-based systems in the `regset.h`
header included by the Boost.Test framework, which causes a compilation
error.

-BEGIN VERIFY SCRIPT-

ren1() { sed -i "s/\<$1\>/$2/g" $( git grep -l "$1" ./src/util/sock.* ./src/httpserver.h ) ; }
ren1 RECV RecvEvent
ren1 SEND SendEvent
ren1 ERR  ErrorEvent

ren2() { sed -i "s/\<$1\>/$2/g" $( git grep -l "$1" ./src/ ) ; }
ren2 Sock::RECV Sock::RecvEvent
ren2 Sock::SEND Sock::SendEvent
ren2 Sock::ERR  Sock::ErrorEvent

-END VERIFY SCRIPT-

src/httpserver.h

@@ -333,8 +333,8 @@ private:
     struct IOReadiness {
         /**
          * Map of socket -> socket events. For example:
-         * socket1 -> { requested = SEND|RECV, occurred = RECV }
-         * socket2 -> { requested = SEND, occurred = SEND }
+         * socket1 -> { requested = SendEvent|RecvEvent, occurred = RecvEvent }
+         * socket2 -> { requested = SendEvent, occurred = SendEvent }
          */
         Sock::EventsPerSock events_per_sock;