Add search_opts into the method list() for VolumeTypeManager

Since the method base.ManagerWithFind.findall has been modified by
adding the search_opts for all tenants support, the parameter
search_opts should also be added to all the manager classes, which
can be called whithin this method. volumetypemanager does not have
this parameter for its method list(). Adding search_opts will resolve
this issue.

Closes-Bug: #1252665

Change-Id: I526500625f1b5483cb5d88ea15e6ac8485a66ae3

Conflicts:
	doc/source/index.rst