Add more detailed errors

[johanbrandhorst]

Fixes #10

[johanbrandhorst]

This produces the following code:

// PodContainerError means a container associated with a pod failed to perform an operation. It contains
// a container ID of the container that failed.
type PodContainerError struct {
    Podname string                  `json:"podname"`
    Errors  []PodContainerErrorData `json:"errors"`
}

func (e PodContainerError) Error() string {
    s := "io.podman.PodContainerError"
    s += fmt.Sprintf("(Podname: %v, Errors: %v)", e.Podname, e.Errors)
    return s
}

[coveralls]

Pull Request Test Coverage Report for Build 329

• 24 of 26 (92.31%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.5%) to 83.17%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
cmd/varlink-go-interface-generator/main.go	24	26	92.31%
<!--	Total:	24	26	92.31%	-->

Totals
Change from base Build 327:	0.5%
Covered Lines:	1186
Relevant Lines:	1426

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 336

• 18 of 22 (81.82%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 82.793%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
cmd/varlink-go-interface-generator/main.go	18	22	81.82%
<!--	Total:	18	22	81.82%	-->

Totals
Change from base Build 335:	0.2%
Covered Lines:	587
Relevant Lines:	709

---

💛 - Coveralls

[johanbrandhorst]

Friendly bump.