XOS GUI for M-CORD sometimes unresponsive

The M-CORD GUI sometimes fails to load with the message:

"Cannot load models definition. Please check that the Chameleon container is running"

The underlying issue is that the modeldefs API is taking up to 15-20 seconds to respond.

A workaround is to rebuild the XOS-GUI container with an increased timeout (say 30 seconds) by changing this line: 

https://github.com/opencord/xos-gui/blob/master/src/app/datasources/rest/modeldefs.rest.ts#L55

Here's a general example of how one would do this (but see below for M-CORD):

git clone https://gerrit.opencord.org/xos-gui
cd xos-gui
# Make edit described above
sudo docker build -t xos-gui .  # Builds xos-gui:latest from local source
cd ~/cord/helm-charts
helm upgrade xos-core xos-core --set xos-gui.imagePullPolicy="IfNotPresent" --set xos-gui.xos_guiImage="xos-gui:latest"

However, the xos-gui Dockerfile performs a multi-stage build and this is is not supported by the version of Docker installed by the "mcord-in-a-box.sh" script. Therefore I have pushed a version of the image to Docker Hub with this change. To deploy the container directly from Docker Hub:

cd ~/cord/helm-charts
helm upgrade xos-core xos-core --set xos-gui.xos_guiImage="andybavier/test-image:xos-gui"