Tidying up how we're handling the different methods

[mslocrian]

There was a lot of repetitive checks happening when differentiating between butler retrieval methods.

Tried to tidy a lot of that up.

I also tweaked how we do the blob storage. Instead of specifying some BUTLER_ specific environment variables and shoving them across to the right azure blob storage vars, I removed that, since it's silly. Just specify what azure expects.

[codecov-io]

Codecov Report

Merging #35 into master will increase coverage by 0.22%.
The diff coverage is 36.99%.

@@            Coverage Diff             @@
##           master      #35      +/-   ##
==========================================
+ Coverage   31.79%   32.02%   +0.22%     
==========================================
  Files          17       17              
  Lines        2120     2133      +13     
==========================================
+ Hits          674      683       +9     
- Misses       1402     1404       +2     
- Partials       44       46       +2

Impacted Files	Coverage Δ
internal/config/manager.go	0% <0%> (ø)	⬆️
cmd/butler/main.go	10.55% <0%> (-1.42%)	⬇️
internal/methods/methods.go	20% <0%> (-1.06%)	⬇️
internal/monitor/monitor.go	83.07% <100%> (ø)	⬆️
internal/config/config.go	18.84% <11.11%> (-1.47%)	⬇️
internal/config/objects.go	4.25% <16.66%> (+4.25%)	⬆️
internal/config/helpers.go	42.56% <49.12%> (-0.38%)	⬇️
internal/methods/blob.go	78.46% <61.11%> (-9.04%)	⬇️
internal/config/handler.go	19.15% <64.51%> (+2.94%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update fa4c10c...69cc67b. Read the comment docs.