containers/common v0.21.0

on GitHub

Add BuildFilter() and ValidateProfile() API
Add FindAppArmorParserBinary() helper
Add mock'able unit tests and move package to `internal`
Add owners file
Bump github.com/containers/image/v5 from 5.5.1 to 5.5.2
Bump github.com/containers/storage from 1.23.2 to 1.23.3
Bump golang to 1.15
Change fmt.Errorf calls to be replaced by errors package
Enable retry EOF from http request
Fix all gocritic lints
Fix nested elseif
Migrate seccomp/containers-golang
RetryIfNecessary: add a field for setting the delay in RetryOptions
Update golangci-lint and add config
Update pkg/config/config_darwin.go
Update pkg/config/config_linux.go
Update pkg/config/config_windows.go
Update pkg/retry/retry.go
Validate that apparmor_parser is available on the system
begin migration off travis
containers.conf: Fix ulimits nofile example syntax
fix windows containers.conf path
getCustomConfigFile for windows and darwin