Improve code.

git-svn-id: http://svn.code.sf.net/p/openmediavault/code/trunk@1216 3c3d7b80-5828-415e-9f61-280b98178fff
Do not check for enough swap space as currently implemented. There is no rule to calculate the required swap space, thus this should be done to prevent false assumptions.

git-svn-id: http://svn.code.sf.net/p/openmediavault/code/trunk@1217 3c3d7b80-5828-415e-9f61-280b98178fff