qemu.tests: Update the summary case for performance

Update the summary case for performance to make it fit for both
iozone and ffsb. And add the write to database part.

There is a key param in the new function "marks". It is following
the format like this separated with blank:
    marks = $key_shows_in_result_table:$pattern_to_find_the_value

changes from v1:
  - Use the out_loop_line to instead order_line inside the loop
    otherwise the iozone results will always be the first
    category's data
changes from v2:
  - Update the summary can get results by configure type and repeat
    times
  - Remove the desc string to fit the newest regresstion.py
  - Add support for qcow2perf results summary
changes from v3:
  - Update the category key get method
  - Remove the debug lines left
changes from v4:
  - Fix the index problem when generate the dict for guests files

Signed-off-by: Yiqiao Pu <ypu@redhat.com>

As there are some prepare cases we don't want to include in our
results summary file, make a ignore_cases list in our cfg files.

Signed-off-by: Yiqiao Pu <ypu@redhat.com>
Acked-by: Feng Yang <fyang@redhat.com>

Now the data get from guest test resutls is not all covered and
will be truncated from float to int. So will add all numbers get
from results and update the pattern in standard_value to get the
float type numbers.

Signed-off-by: Yiqiao Pu <ypu@redhat.com>

As the regression.py requires the summary results have the same order
for different round results of the same test. So just make a list
with keys in dict with order.

Signed-off-by: Yiqiao Pu <ypu@redhat.com>

In the old code the results as read and write will be write to the
results_matrix which will cause the empty table in results file.
Just remove them from the matrix and only put them into the
no_table_reulsts dict.

Signed-off-by: Yiqiao Pu <ypu@redhat.com>

Update the version info to fit the regression.py requirement.

Signed-off-by: Yiqiao Pu <ypu@redhat.com>

Replace the cache in data line to head line as required when summary
qcow2perf results.And remove the comments line in scripts.

Signed-off-by: Yiqiao Pu <ypu@redhat.com>