Remove redundant shell function

This was used before http_call was made, but that function effectively
inlines it.
Merge pull request #210 from squaremo/remove_redundant_shellfunc

Remove redundant shell function
Set 'Unsafe' flag to allow dns.Server to handle responses
Rename 'server' to 'listener' to better match how it is used
Merge branch 'master' into 177_ip_allocation