bat: Specify where to run bat tests from
bat: Specify where to run bat tests from

Bat test requires access to a ciao cluster and for storage
tests it requires qemu-img and access to the ceph cluster.

This change updates _relase/bat/README.md to

- Instruct the user to run the tests from the controller
- Fix typo in 'wildcard'
- Fix hyperlink to singlevm

Signed-off-by: Alberto Murillo Silva <3e496b67a60a13551c6a151e0a6a52025fbd95e6@intel.com>

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