using docker-compose from a container when no docker-compose available

[fabriciojs]

related to #241 #166

• Refactor start, stop and exec commands
• Refactor logs, status commands
• Add tests to new compose.DockerCompose command
• Fix always using --user on docker-compose exec
• Make usage of local docker-compose when available as default
• Update tests accordingly

[codecov]

Codecov Report

Merging #243 (c6837b4) into master (bb23a49) will increase coverage by 0.13%.
The diff coverage is 96.92%.

@@            Coverage Diff             @@
##           master     #243      +/-   ##
==========================================
+ Coverage   87.64%   87.77%   +0.13%     
==========================================
  Files          65       66       +1     
  Lines        2468     2512      +44     
==========================================
+ Hits         2163     2205      +42     
- Misses        282      283       +1     
- Partials       23       24       +1     

Impacted Files	Coverage Δ
cmd/shell/shell.go	80.00% <77.77%> (-2.11%)	⬇️
cmd/checker/checker.go	100.00% <100.00%> (ø)
cmd/compose/docker-compose.go	100.00% <100.00%> (ø)
cmd/docker.go	100.00% <100.00%> (ø)
cmd/exec.go	100.00% <100.00%> (ø)
cmd/logs.go	100.00% <100.00%> (ø)
cmd/start.go	100.00% <100.00%> (ø)
cmd/status.go	100.00% <100.00%> (ø)
cmd/stop.go	100.00% <100.00%> (ø)

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