Update datastore analysis (added iscsi and bz mark)

Added `iscsi` + BZ mark that will skip it until the [RFE BZ](https://bugzilla.redhat.com/show_bug.cgi?id=1091033) is satisfied.

Tested on 5.2, 5.3 and Upstream - v4, v5 and v55. (in Chrome only; my FF is acting up so Im already setting up docker bot).
(Rhevm and scvmm is not supported)
__Do update your yamls, there has been a few changes to datastores.__