[testing] Bump client recv timeout to 10 sec

The 2 sec timeout is typically enough, but some unit tests
do call stuff which could end up having to wait for disk
(compact db for instance) and on the CV builders we run
a lot of the test concurrently which may slow things down
a lot so we've seen a number of unit tests fails due
too aggressive timeouts.

Change-Id: I3618629c7f26e58432f0073e6190035742cd8062
Reviewed-on: https://review.couchbase.org/c/kv_engine/+/180586
Tested-by: Build Bot <build@couchbase.com>
Reviewed-by: Dave Rigby <daver@couchbase.com>

protocol/connection/client_connection.cc

@@ -280,8 +280,9 @@ MemcachedConnection::MemcachedConnection(std::string host,
         // cluster
         timeout = std::chrono::minutes{30};
     } else {
-        // When running in unit tests we want it to fail fast
-        timeout = std::chrono::seconds{2};
+        // When running in unit tests we want it to fail fast, but not
+        // too fast as the CV builders are sometimes heavily loaded
+        timeout = std::chrono::seconds{10};
     }
 
     if (ssl) {