Add more default locations for docker-compose command

[laurentpellegrino]

By default it is assumed that docker-compose command is located in /usr/local/bin/. This location seems specific to some distributions. For instance, the default location on Fedora systems is /usr/bin/.

I know the location is configurable through property docker.compose.command but I think it would be nice to add support for default location on most standard systems like it is done for instance with Matlab and Scilab connectors if I remember correctly.

This could be done with the help of method that checks for the existance of the binary docker-compose in a specified list of locations.

[tobwiens]

What if we leave the docker.compose.command field empty and the user needs to configure it. That will not favor any operating system.
And when the field is left empty, the docker-compose script engine is kind of "shut off" and does not write logs.

[laurentpellegrino]

In that case how the user will know that there is a missing configuration? he will just get an error?

Personnally, I prefer to make configuration as transparent and simple as possible for users. However, it's just my opinion. The best is to ask Brian.

[tobwiens]

Yes the user will get an error, something like docker-compose not found at "[PATH]".
If it is configured and there is no docker-compose installed it will give an error too.