This recommended update for wicked fixes the following issues:

- updates Version to 0.6.15
* nanny: use ifindex to reference workers in managed devices and hold worker references when starting fsm (bsc#904061)
* nanny: Always reference mdev's worker by ifindex (bsc#904061)
* nanny: register discovered devices only when ready (bsc#904061)
* events: query and update device name on events (bsc#904061)
* udev: verify netdev index and update name at start, disable ready handling if udev is not used, e.g. in LXC (bug#904061)
* xml: don't require parent's control node in config (bsc#901517)
* wireless: use string dict entry for WIRELESS_AP/bssid (bsc#911315)
* extensions: fixed false errors from hostname update (bsc#910323)
* tuntap: typo fix causing to not set IFF_NO_PI flag
* fixed some memory leaks in client and dbus object code
* doc/ChangeLog: do not omit merge commits which contain bug refs