Fixes a bug when attempting to access a non-existant IP from
GetIPfromPID called via the list API.
Renames the provider from faas-containerd
Updates function deletion grace period to 30s to prevent any
errors in the REST API during a long-running deletion.
Tested on Linux with the figlet function which by default takes
around 5s to delete due to its write_timeout value, the deletion
now blocks rather than throwing an error.
Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>