DataSourceCloudStack: use virtual router rather than default route

In CloudStack's documentation, it is stated that meta/user-data can be
retrieved from CloudStack's Virtual Router [1].

However, cloud-init retrieves these information from default gateway. VR
and default gateway may be the same machine (i.e. have the same address)
in some cases, but that is not be always true (actually, in my case, it is
not).

This change searches the lease files in /var/lib/dhclient to pick out 
the dhcp-server-identifier.

It admittedly does make this specific to dhclient.

--
[1] http://incubator.apache.org/cloudstack/docs/en-US/Apache_CloudStack/4.0.0-incubating/html/Admin_Guide/user-data-and-meta-data.html).

LP: #1089989

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