Bump Dockerfiles and mentions of alpine 3.7 to be now
3.8

Signed-off-by: Martin Dekov (VMware) <mdekov@vmware.com>

Signed-off-by: Radoslav Dimitrov <rdimitrow@gmail.com>

Bumping the watchdog to 0.9.4 in
mentioned places

Signed-off-by: Martin Dekov (VMware) <mdekov@vmware.com>

Convert all sample-functions to use curl to get the watchdog as
it can be cached by Docker. Issue #841

Signed-off-by: Radoslav Dimitrov <rdimitrow@gmail.com>

Moves to 0.9.0

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

This updates alpine version to 3.7 in sample-functions, gateway
and some markdown docas.

Signed-off-by: Ivana Yovcheva (VMware) <iyovcheva@vmware.com>

This updates watchdog version to latest 0.8.0 in the functions
samples and documentation

Signed-off-by: Ivana Yovcheva (VMware) <iyovcheva@vmware.com>

This updates fwatchdog to latest version (0.7.9) in all templates
in sample-functions and faas version in the documentation

Signed-off-by: Ivana Yovcheva (VMware) <iyovcheva@vmware.com>

Update the NodeInfo sample function to use latest
watchdog version (0.7.7) to support both GET and POST method.

Signed-off-by: Vivek Singh <vivekkmr45@yahoo.in>

Also bumps golang builder version to 1.9.4 for sample functions.

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

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

Note, not all `alexellis/github` references should be changed, there are
a number of repos which are not part of the openfaas org, this commit
excludes those.

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

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