Ganeti QA: Speed up hvparam checks by reducing number of tests
Ganeti QA: Speed up hvparam checks by reducing number of tests

Currently, the hvparam alternation code runs _all_ instance tests for
each hvparam change. This commit reduces these tests to a smaller
subset (so called 'common' instance tests). That should speed up the QA
suite a lot. The QA suite still runs all instance tests with the default
set of hvparams.

Signed-off-by: Rudolph Bott <4dc7c9ec434ed06502767136789763ec11d2c4b7@spam.wtf>

ganeti/ganeti,ganeti/ganeti,ganeti/ganeti