refactor on metadata to handle both apps and jobs

[codecov-commenter]

Codecov Report

Patch coverage: 89.02% and project coverage change: +0.13% :tada:

Comparison is base (50d60fd) 71.13% compared to head (1c6b2c8) 71.27%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #211 +/- ## ========================================== + Coverage 71.13% 71.27% +0.13% ========================================== Files 44 44 Lines 8187 8219 +32 ========================================== + Hits 5824 5858 +34 + Misses 1533 1532 -1 + Partials 830 829 -1 ``` | [Files Changed](https://app.codecov.io/gh/tsuru/tsuru-client/pull/211?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=tsuru) | Coverage Δ | | |---|---|---| | [tsuru/client/metadata.go](https://app.codecov.io/gh/tsuru/tsuru-client/pull/211?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=tsuru#diff-dHN1cnUvY2xpZW50L21ldGFkYXRhLmdv) | `79.01% <88.00%> (+5.87%)` | :arrow_up: | | [tsuru/client/jobs.go](https://app.codecov.io/gh/tsuru/tsuru-client/pull/211?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=tsuru#diff-dHN1cnUvY2xpZW50L2pvYnMuZ28=) | `63.66% <100.00%> (+0.40%)` | :arrow_up: | | [tsuru/main.go](https://app.codecov.io/gh/tsuru/tsuru-client/pull/211?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=tsuru#diff-dHN1cnUvbWFpbi5nbw==) | `93.47% <100.00%> (ø)` | |

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