automated/linux/piglit: Add support to ignore tests from repo/file

The piglit tool support regex exclusion (-x) to avoid run certain tests
but in order to exclude a high number of tests [1] isn't usable because
needs to be passed into the command line and there are limits in the
amount of data that you can pass using cmdline.

In my use case i want to exclude 212 failing tests [1].

[1]
https://qa-reports.linaro.org/qcomlt/openembedded-rpb-rocko/build/146/testrun/1787216/

Change-Id: I4b96e3c2540a4ba14bc086b5eb7856d67bc2b8de
Signed-off-by: Aníbal Limón <anibal.limon@linaro.org>
2 files changed