change errors.Errorf to *.Wrapf and *.Wrap

[developerfred]

fixes: #236

Fix
#236 (comment)

[krasi-georgiev]

Thanks for the update, left few comments, please have a look at all other occurrences and continue in the same direction.

[developerfred]

@krasi-georgiev thanks for review! I make changes.

[krasi-georgiev]

please change the rest of the PR according to my comments as these changes apply in many different places not just the ones I pointed.

To save time please review our errors format guidlines

[krasi-georgiev]

ping when ready for another review or if you get stuck making all tests pass.

[coveralls]

Pull Request Test Coverage Report for Build 374531539

• 2 of 123 (1.63%) changed or added relevant lines in 25 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.05%) to 36.771%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/ops/miningManager.go	0	1	0.0%
pkg/ops/requestDataWorker.go	1	2	50.0%
pkg/pow/miningSetup.go	0	1	0.0%
pkg/tracker/currentVariables.go	0	1	0.0%
pkg/tracker/retryFetcher.go	1	2	50.0%
pkg/tracker/valueGenerators.go	0	1	0.0%
pkg/util/httpRetriever.go	0	1	0.0%
pkg/tracker/runner.go	0	2	0.0%
pkg/dataServer/dataServer.go	0	3	0.0%
pkg/db/localDataProxy.go	0	3	0.0%

Totals
Change from base Build 374497508:	0.05%
Covered Lines:	1601
Relevant Lines:	4354

---

💛 - Coveralls

[developerfred]

@krasi-georgiev double check in files and test pass done.

[krasi-georgiev]

We are going in a good direction, thanks.
Please review my comments and check the rest of the pr to make sure you apply the same principles everywhere.

[krasi-georgiev]

for the CI error you can run make lint locally to find out why it happens

[krasi-georgiev]

btw in few minutes will merge another big PR that does some other global refactorings so there will be some conflict to be resolved and unfortunately we can't avoid it, but shouldn't be too difficult to resolve.

[coveralls]

Pull Request Test Coverage Report for Build 375517800

• 3 of 117 (2.56%) changed or added relevant lines in 24 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 36.72%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/ops/miningManager.go	0	1	0.0%
pkg/ops/requestDataWorker.go	1	2	50.0%
pkg/pow/miningSetup.go	0	1	0.0%
pkg/tracker/currentVariables.go	0	1	0.0%
pkg/tracker/retryFetcher.go	1	2	50.0%
pkg/tracker/valueGenerators.go	0	1	0.0%
pkg/util/httpRetriever.go	0	1	0.0%
pkg/tracker/runner.go	0	2	0.0%
pkg/util/logConfig.go	0	2	0.0%
pkg/dataServer/dataServer.go	0	3	0.0%

Totals
Change from base Build 374842204:	0.0%
Covered Lines:	1601
Relevant Lines:	4360

---

💛 - Coveralls

[krasi-georgiev]

Thanks!