Bug 2132: Remove tags

Heal tests should not have prepare/verify tags as those are used
for upgrade testing, and so cannot be 'prepared' on older versions
of OSM.

Fixes Bug 2132

Change-Id: I4e886ceea798507a0afed8bf23b3f48074fd0f51
Signed-off-by: Mark Beierl <mark.beierl@canonical.com>