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/test/sock_tests.cpp

@@ -148,7 +148,7 @@ BOOST_AUTO_TEST_CASE(wait)
 {
     TcpSocketPair socks = TcpSocketPair{};
 
-    std::thread waiter([&socks]() { (void)socks.receiver.Wait(24h, Sock::RECV); });
+    std::thread waiter([&socks]() { (void)socks.receiver.Wait(24h, Sock::RecvEvent); });
 
     BOOST_REQUIRE_EQUAL(socks.sender.Send("a", 1, 0), 1);