namespaces: default all the namespaces to 'yes' when CONFIG_NAMESPACES is selected

As the different namespaces depend on 'CONFIG_NAMESPACES', it is logical
to enable all the namespaces when we enable NAMESPACES.
Signed-off-by: Daniel Lezcano <daniel.lezcano@free.fr>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: David Miller <davem@davemloft.net>
Acked-By: Matt Helsley <matthltc@us.ibm.com>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

init/Kconfig

@@ -746,6 +746,7 @@ config NAMESPACES
 config UTS_NS
 	bool "UTS namespace"
 	depends on NAMESPACES
+	default y
 	help
 	  In this namespace tasks see different info provided with the
 	  uname() system call
@@ -753,6 +754,7 @@ config UTS_NS
 config IPC_NS
 	bool "IPC namespace"
 	depends on NAMESPACES && (SYSVIPC || POSIX_MQUEUE)
+	default y
 	help
 	  In this namespace tasks work with IPC ids which correspond to
 	  different IPC objects in different namespaces.
@@ -760,6 +762,7 @@ config IPC_NS
 config USER_NS
 	bool "User namespace (EXPERIMENTAL)"
 	depends on NAMESPACES && EXPERIMENTAL
+	default y
 	help
 	  This allows containers, i.e. vservers, to use user namespaces
 	  to provide different user info for different servers.
@@ -767,8 +770,8 @@ config USER_NS
 
 config PID_NS
 	bool "PID Namespaces"
-	default n
 	depends on NAMESPACES
+	default y
 	help
 	  Support process id namespaces.  This allows having multiple
 	  processes with the same pid as long as they are in different
@@ -776,8 +779,8 @@ config PID_NS
 
 config NET_NS
 	bool "Network namespace"
-	default n
 	depends on NAMESPACES && NET
+	default y
 	help
 	  Allow user space to create what appear to be multiple instances
 	  of the network stack.