removed obsolete BuildRequires, removed empty testsuite

- removed BuildRequires:
    - yast2-mouse
    - yast2-transfer
    - yast2-bootloader
    - xorg-x11-libs 
    - pkg-config
    - libxslt
    - perl-XML-Writer
    - yast2-testsuite
    - yast2-country
    - yast2-slp
    - python-xml
    - yast2
    - yast2-update
    - yast2-storage
- 3.0.1