Memcached : update recipe and profile, copying from mysql

software/memcached/software.cfg

 [buildout]
 
 sources = sources
-auto-checkout = mysql
+auto-checkout = memcached
 
 extensions =
   slapos.tool.networkcache
@@ -36,7 +36,7 @@ unzip = true
 
 [sources]
 # Include information related to official mysql source code.
-mysql = git http://git.erp5.org/repos/slapos.git branch=memcached
+memcached = git http://git.erp5.org/repos/slapos.git branch=memcached
 
 [rebootstrap]
 # Default first version of rebootstrapped python