update some testcases

[Lili Nie]

Hi all,
    
    I have taken part in the "improve the test wiki page"proposed by Tao Wu.
    As there is huge change in f18, some test cases in the "test wiki page"seem to be inapplicable.
    I suggest to modify some of them, as the following:

 Testcase::https://fedoraproject.org/wiki/QA:Testcase_Anaconda_autopart_%28encrypted%29_install
 How to test
    Boot the installer using any available means
    Make sure your disk is set to be encrypted
    you can encryted the whole disk before custom partitioning your disk
    or encryted part of the disk (for example,/root) after custom partitioning your disk
    Select the appropriate disk, and continue installation, choosing all provided defaults
    After installation is complete, perform QA:Testcase_base_startup to ensure the installed system boots correctly with the encrypted partitioning

 Testcase::https://fedoraproject.org/wiki/QA:Testcase_Anaconda_autopart_%28use_free_space%29_install
 How to test
    Boot the installer using any available means
    Make sure your disk is not set to be encrypted
    Select the appropriate disk, and continue installation, choosing all provided defaults
    As for the text mode, you should choose"use free space"for the Autopartitioning Options
    Complete the installation

  Testcase:: https://fedoraproject.org/wiki/QA:Testcase_Partitioning_No_Swap
    How to test
    Boot the installer using any available means (netinst/boot.iso, PXE, or DVD)
    Click into Installation Destination, select Let me custom the partitioning of the disk instead,select Continue
    At the manual partitioning screen, remove the swap partition created by anaconda, and select Finish Partitioning
    Complete the installation

   Testcase:: https://fedoraproject.org/wiki/QA:Testcase_anaconda_ext3_rootfs_on_disk_partition
    How to test
    Boot the installer using any available means (netinst/boot.iso, PXE, or DVD)
    Click into Installation Destination, select Let me custom the partitioning of the disk instead,select Continue
    At the manual partitioning screen, choose root and click Customize
    Place the root filesystem(/) on an ext3 formatted partition,and select Finish Partitioning
    Complete the installation

  Testcase::https://fedoraproject.org/wiki/QA:Testcase_anaconda_xfs_rootfs_on_disk_partition
    Boot the installer using any available means (netinst/boot.iso, PXE, or DVD)
    Click into Installation Destination, select Let me custom the partitioning of the disk instead,select Continue
    At the manual partitioning screen, choose root and click Customize
    Place the root filesystem(/) on an xfs formatted partition,and select Finish Partitioning
    Complete the installation
 
  Testcase:: https://fedoraproject.org/wiki/QA:Testcase_anaconda_ext4_rootfs_on_disk_partition
     Boot the installer using any available means (netinst/boot.iso, PXE, or DVD)
    Click into Installation Destination, select Let me custom the partitioning of the disk instead,select Continue
    At the manual partitioning screen, choose root and click Customize
    Place the root filesystem(/) on an ext4 formatted partition,select Standard Partition for Device type  
    Select Finish Partitioning，and Complete the installation

   Any comments on these will be welcome, and as soon as we have a decision
   on the changes, I will update the wiki-page.

  Thank you,
  Lili Nie