Make daemon to start with no userlandproxy by default

This PR makes a user visible behavior change with userland
proxy disabled by default and rely on hairpin NAT to be enabled
by default. This may not work in older (unsupported) kernels
where the user will be forced to enable userlandproxy if needed.

      - Updated the Docs
      - Changed the integration-cli to start with userlandproxy
	desiabled by default.

Signed-off-by: Jana Radhakrishnan <mrjana@docker.com>

docs/reference/commandline/daemon.md

@@ -56,7 +56,7 @@ weight=1
       --tlscert="~/.docker/cert.pem"         Path to TLS certificate file
       --tlskey="~/.docker/key.pem"           Path to TLS key file
       --tlsverify=false                      Use TLS and verify the remote
-      --userland-proxy=true                  Use userland proxy for loopback traffic
+      --userland-proxy=false                  Use userland proxy for loopback traffic
 
 Options with [] may be specified multiple times.
 

man/docker.1.md

@@ -161,7 +161,7 @@ unix://[/path/to/socket] to use.
   Default is false.
 
 **--userland-proxy**=*true*|*false*
-    Rely on a userland proxy implementation for inter-container and outside-to-container loopback communications. Default is true.
+    Rely on a userland proxy implementation for inter-container and outside-to-container loopback communications. Default is false.
 
 **-v**, **--version**=*true*|*false*
   Print version information and quit. Default is false.