Increase coverage report precision
Increase coverage report precision

It sets the number of digits after the decimal point to display for
reported coverage percentages. The default is 0, displaying for
example "87%". A value of 3 will display percentages like "87.325%".

Change-Id: I0313e9d7bead4a229f03cec6f603709502757394

esikachev/sahara-tests,openstack/sahara-tests,openstack/sahara-scenario,openstack/sahara-tests,esikachev/sahara-tests,openstack/sahara-tests,openstack/sahara-scenario,openstack/sahara-tests,openstack/sahara-scenario,esikachev/sahara-tests