Allow to define the mountpoint name for managed network shares

Allow administrators to define another mount point (name, not path) for managed shares in managedNetworkShares (available with v3). Administrators already can change the location (location), but are unable to change the name of the mount point itself.

I.g. smb://my.super.share.tld/path_name will be mounted to path_name.

With the new managedNetworkShares we're able to add more config values to the managed shares. Also mountPoint, to change the name of the mount point.

example:

<key>networkShare</key>
<string>smb://my.super.share.tld/path_name</string>
<key>mountPoint</key>
<string>setMyName</string>

result: smb://my.super.share.tld/path_name > share will be mounted to $networkShareMounterDefaultLocation/setMyName