distro: add "everyboot" option.
Merge branch 'feature-everyboot-script'
hypervisor: add postcopy to post phase.
hypervisor: add postcopydir to post phase.
hypervisor: add postxexecscript to post phase.
Merge branch 'feature-post-phase'
distro: keep original file mode.
Merge branch 'fix-copy-install-mode'
Merge pull request #29 from hansode/master

features