Bump dependency requirements
Use the oVirt REST API to find out the guest IP address

This replaces the old nmap broadcast/arp hack which was
previously used to find out the guest IP address and also
allows the vagrant-ovirt plugin to be used from different
network subnets.

Requires https://github.com/fog/fog/pull/3162 and a box
image which contains the package 'ovirt-guest-agent'
Version bump.
Fixing README
Prevent endless loop when SSH authentication fails
Allow network interface type to be specified

This change also fixes the following error on modern RHEV/oVirt environments:
ERROR vagrant: #<VagrantPlugins::OVirtProvider::Errors::AddInterfaceError: Error while adding new interface to VM. rhevm is not a member of NicInterface. Possible values for NicInterface are: e1000, virtio, rtl8139, rtl8139_virtio, spapr_vlan>
ERROR vagrant: Error while adding new interface to VM. rhevm is not a member of NicInterface. Possible values for NicInterface are: e1000, virtio, rtl8139, rtl8139_virtio, spapr_vlan