need to insert an extra space when tab is pressed after user enters enough characters to select the correct command

[smytht]

most of the usual cisco-like CLIs will automatically insert a space
after tab-completion finds a unique command, so e.g. you can do 'shrun"
without typing an extra space; might be a useful addition for people
coming from other systems.

Thanks to Stuart Henderson for feeding this back to us

[smytht]

sorry about this git hub chewed up the 'sho[tab]run' which is actually what Stuart to raised on openbsd ports@
it is a useful feature and does save key strokes ... which im all for :)

[smytht]

Thanks Stefan for the Fix, and thanks Stuart Henderson for the feeback latest commit PR 72 fixes this issue