Add PowerPC support in templates
    
    * use only a subset of tests for ppc64 and ppc64le
      with a new "Fedora PowerPC group"
      and only three flavors
      "Server-boot-iso", "Server-dvd-iso", "universal",
    
    * TEST_TARGET for all PowerPC Products set as ISO
    
    * increase disk size for asian cyrillic and european tests
      add HDDSIZEGB = 12  for related tests
      install_asian_language install_cyrillic_language
      install_european_language
      This is required to avoid anaconda failure like:
      (my own translation)
      "... Fedora requests 10.03GB of free space,
      with 5.95GB for software and 4.08GB for swap.
      Your selected disks have the following free space:
      10GB free space for use..."
    
    * Remove hardcoded arch in some HDD_1 key replaced by ARCH variable
      That concerns the images generated by createhdds tool
      (only for supported PowerPC tests not all of them)
      eg change from:
      "disk_f%CURRREL%_support_3_x86_64.img"
      to:
      "disk_f%CURRREL%_support_3_%ARCH%.img"
      Warning: use ARCH and not MACHINE variable
    
    * Try to keep same order for PowerPC as for x86_64 tests
      and same priorities as documented in
      cid a5861ebc5d56a8b8d7fca40e00f21b21a203c371:
        0-20: critical smoke tests (higher than Alpha priority)
        20-29: Alpha priority
        30-39: Beta priority
        40-49: Final priority
        50+: Optional priority
    
    * force nfsvers=4 as bypass bugs:
      https://bugzilla.redhat.com/show_bug.cgi?id=1386059
      https://bugzilla.redhat.com/show_bug.cgi?id=1368932
    
    * role_deploy_domain_controller failed for ppc64 (BE)
      https://bugzilla.redhat.com/show_bug.cgi?id=1437793
    
    * Warning: tests failure for PowerPC, not added:
      install_delete_pata
      install_sata
      install_package_set_kde
      install_updates_img_local
    * tests not tried:
      upgrade_server_domain_controller
      upgrade_realmd_client
      upgrade_desktop_encrypted_64bit
    
    * Note: TIMEOUT_SCALE initially set for PowerPC machines
      has been removed from this commit as seems not required
      anymore after upstream merge.
      Will need to track if two following timer values
      may create problem on remote openQA instances:
      tests/install_source_graphical.pm (300 to 600)
      tests/_boot_to_anaconda.pm (300 to 1200)
    
    Signed-off-by: Guy Menanteau <menantea@linux.vnet.ibm.com>
    Signed-off-by: Michel Normand <normand@linux.vnet.ibm.com>