cleaned up the files and added golanglintci file

[stikkireddy]

Updated the makefile to use golanglintci file

Fixed make build bug:

• fixed a bug where make build just runs format before running build so travis never fails.

make fmt now:

1. applies import resorting
2. gofmt -s which simplifies code.

Fixed the following:

1. fixed trailing whitespace
2. Import formatting issues
3. Typos
4. IfElse chains -> switch statements
5. simplify value = otherValue + value to value += otherValue
6. Allowed parameter interface types from io.ReadCloser -> io.Reader

[codecov-commenter]

Codecov Report

Merging #102 into master will decrease coverage by 0.06%.
The diff coverage is 20.58%.

@@            Coverage Diff             @@
##           master     #102      +/-   ##
==========================================
- Coverage   47.79%   47.72%   -0.07%     
==========================================
  Files          53       53              
  Lines        6884     6893       +9     
==========================================
  Hits         3290     3290              
- Misses       3543     3552       +9     
  Partials       51       51              

Flag	Coverage Δ
#client	76.45% <82.35%> (ø)
#provider	39.45% <0.00%> (-0.07%)	⬇️

Impacted Files	Coverage Δ
client/service/clusters.go	100.00% <ø> (ø)
client/service/instance_pools.go	85.71% <ø> (ø)
client/service/instance_profiles.go	100.00% <ø> (ø)
client/service/jobs.go	100.00% <ø> (ø)
client/service/libraries.go	100.00% <ø> (ø)
client/service/mask_utils.go	75.51% <ø> (ø)
client/service/mws_credentials.go	0.00% <ø> (ø)
client/service/mws_customer_managed_keys.go	0.00% <ø> (ø)
client/service/mws_networks.go	0.00% <0.00%> (ø)
client/service/mws_storage_configurations.go	0.00% <ø> (ø)
... and 31 more