[Ubuntu LEB] Add test case for LibreOffice

[Ricardo Salveti]

The purpose of the test:
 * Make sure the LibreOffice suite is working properly at ARM

The target platform (currently Android or Ubuntu):
 * Ubuntu

The proposed steps for performing the test:
 * Install the libreoffice package: $ sudo apt-get install libreoffice
 * Open both Writer and Calc, making sure they are functional (able to write something, save and close successfully)
 * Open Impress using the presentation available at http://elinux.org/images/8/87/Linaro_2011_ELC_Talk.odp
    - Go to presentation mode by pressing F9
    - Go through the slides, checking if the performance is reasonable enough to be used in a real presentation

Any hardware requirements:
 * Board with enough power to have Ubuntu Desktop running

Setup steps, if anything above a normal install is needed
 * None

Approximate time it takes to run the test
 * Install will download around 120MB, which will depend on the connection used
 * After installed, 20 minutes

Whether or not the test should be considered for release critical testing
 * No, not critical (can be covered at least one a month)

[Milosz Wasilewski (mwasilew)]

There is no LibreOffice in engineering builds. I'm closing the bug. Please comment if you feel it is still important.