Test should accept "Driver type" as an input to reuse existing E2E automated tests

[shuklanirdesh82]

existing test target should be enhanced to accept "driver type" as an user input.

The benefit of doing this to leverage existing test to extend test coverage for "shared" plugin.

e.g. docker volume create -d <driver_name> -name=abc

Currently driver name is controlled through test constants, it should be configurable through command line.

current code: https://github.com/vmware/docker-volume-vsphere/blob/master/tests/constants/dockercli/cmd.go#L46

	// VDVSPluginName name of vDVS plugin
	VDVSPluginName = "vsphere "

/CC @luomiao @tusharnt @shivanshu21

[luomiao]

Need to explore if this is needed.

[shuklanirdesh82]

adding mustfix kw to finish investigation.

[luomiao]

Closed by #1886