* normalize '.' (dot) to '-' (dash) in service names
* added warning about the dot character replacements in service names
* fix gofmt compliance
* also normalize container names (need lowercase)
* splitted normalization for volumes and service names into different functions (it conflicted with './' volumes replacement)
* changed volume normalization to use the new own normalization function
* changed container normalization to use its new own normalization function
* updated as per discussed in PR #1063 review
This does a major refactor on the compose.go functions as well as brings
in a new era of v3 support to Kompose.
Similar to how we utilize libcompose, we utilize docker/cli's "stack
deploy" code which has a built-in v3 parser. We convert the parsed
structure to our own and then convert it to Kubernetes/OpenShift
artifacts.
