In I415eee7ddc601d1706a5d7f2a561e11b642fa826 the 'storage_vnx_pool_name'
parameter was essentially renamed to 'storage_vnx_pool_names'. This patch
adds support for the new name, and accepts the old name so current THT
continue work.
Related-Bug: #1775375
Depends-On: I415eee7ddc601d1706a5d7f2a561e11b642fa826
Change-Id: Ia48bbb88f6bc8180bfb6981813333eee70db79bb