QA:Testcase partitioning custom no swap

Description

An installation without specifying a swap partition. The installer should warn, but not restrict this request.

How to test

1. Boot the installer using any available means (netinst/boot.iso, PXE, or DVD)
2. Proceed to the installation partition screen by selecting appropriate defaults
3. At the first disk partitioning screen, select Review and modify partitioning layout, select Next
4. At the disk druid screen, remove the swap partition created by anaconda, and select OK to continue
5. Complete the installation

Expected Results

1. Anaconda warns that system performance may suffer without a swap partition
2. Anaconda allows the installation to complete successfully
3. Reboot successfully into installed system
4. Confirm that no swap partition is in use (/proc/swaps)