systemd in F21 breaks namespaces for units

[Reindl Harald]

https://bugzilla.redhat.com/show_bug.cgi?id=1184016

most, if not all of my systemd-units on a dozen of servers using 
constructs like below to make the whole tree /var/lib readonly and the 
needed subfolder RW which is now broken in Fedora 21 and kills all my setups

that is a *major regression* because this affects a lot of customized, 
non-packaged systemd units all over the place
____________________________

ReadOnlyDirectories=/var/lib
ReadWriteDirectories=/var/lib/mysql

150120 13:44:01 [ERROR] Can't start server : Bind on unix socket: 
Read-only file system
150120 13:44:01 [ERROR] Do you already have another mysqld server 
running on socket: /var/lib/mysql/mysqld_dbmail.sock ?

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