helm honor os env

[1337andre]

it would be nice, if helm would honor env variables like https_proxy.

[CLAassistant]

All committers have signed the CLA.

[codecov-io]

Codecov Report

Merging #1306 into master will decrease coverage by 25.3%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           master    #1306       +/-   ##
===========================================
- Coverage   37.08%   11.78%   -25.31%     
===========================================
  Files          59       70       +11     
  Lines        9093    30178    +21085     
===========================================
+ Hits         3372     3556      +184     
- Misses       5217    26105    +20888     
- Partials      504      517       +13

Impacted Files	Coverage Δ
util/helm/helm.go	63.63% <100%> (+0.3%)	⬆️
server/project/project.pb.gw.go	0% <0%> (ø)	⬆️
server/application/forwarder_overwrite.go	100% <0%> (ø)	⬆️
pkg/apis/application/v1alpha1/types.go	18.48% <0%> (ø)
pkg/apis/application/v1alpha1/generated.pb.go	0.55% <0%> (ø)
pkg/apis/application/v1alpha1/register.go	0% <0%> (ø)
server/project/project.pb.go	0.85% <0%> (ø)
...apis/application/v1alpha1/zz_generated.deepcopy.go	2.98% <0%> (ø)
server/application/application.pb.go	0.55% <0%> (ø)
test/testdata.go	0% <0%> (ø)
... and 4 more

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[alexmt]

LGTM