Reduce RAM usage for HTTP PXE boot

Merged Philip Müller requested to merge elishl:master into master

Created by: elishl

Move the .sfs files from the "/run/miso/httpspace" directory to "/run/miso/copytoram" directory instead of copying them while using HTTP PXE boot. This way, only a single set of the .sfs files will be stored in memory.

Other PXE boot methods (NFS & NBD) remain unaffected.

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