This commit updates the linux (both ARM and x86) deploy_stack scripts to
check for the availability of the Docker command and print the same
error returned by the PS1 script if not found.

Signed-off-by: John McCabe <john@johnmccabe.net>

This commit reorgs the TestDrive section slightly, explicitly calling out the one-line scripts used to start the FaaS stack locally.

Signed-off-by: John McCabe <john@johnmccabe.net>

This commit adds a PowerShell script that mirrors the existing `deploy_stack.*` scripts.

It also checks that docker is installed and returns a readable error if not found (the alternative is a rather cryptic PowerShell error).

The docker stack command itself returns a readable error if no swarm has been initialised.

Signed-off-by: John McCabe <john@johnmccabe.net>

Allow restarts of up to 5 times with 5 sec delays

Signed-off-by: Alex <alexellis2@gmail.com>

Signed-off-by: Alex <alexellis2@gmail.com>

New armhf and updated sample function Dockerfiles

Signed-off-by: rgee0 <richard@technologee.co.uk>

Bump armhf Gateway to 0.6.0

Signed-off-by: Alex Ellis <alexellis2@gmail.com>

Signed-off-by: John McCabe <john@johnmccabe.net>