fixed VF selection issue from PF

refactoring caused a new issue with selecting a free VF given a
PF name.

Change-Id: Ia7f1e62a55a67a752770332dafc9d1f632479ae4

Releasing version v0.4.0

 - Supports VF information given from a meta-plugin
 - Container based deployment

added support with VF device information

    This change enables this plugin to accept VF information
    provided by another plugin e.g cnishim. Pluging now accepts
    pre-allocated VF informaiton such as VF number, PCI address
    and PF information.

Change-Id: I87c6ffa47521c9927d221876bedf6016dd5d56c2

fix deletion error with empty if0name

If if0name parameter is emtpy then plugin save dpdk information with
CNI_IFNAME value. On deletion it unable to find the file and throws
error. This patch fix this issue.

Change-Id: Ia685f1780822fa13021ba73160245f24a421b5e9

adding only shared vfs and excluding phys port id support

Make run test case more easy