feat(modules): migrate to go modules and bump go version 1.14.4

[prateekpandey14]

Signed-off-by: prateekpandey14 prateek.pandey@mayadata.io

Pull Request template

Why is this PR required? What issue does it fix?:

This PR enables the zfs localpv to be built using Go Modules

Changes Made include

• changes in the Makefile to add go mod tidy, verify & vendor commands and GO111MODULE=on
• changes in travis.yml & travis.sh to enable its building from gomodules
• adds vendor folder
• removes Gopkg lock & toml
• bump travis go version to 1.14.4 for better go module support

Steps Performed

• Go mod init
• Go mod tidy
• Added go mod tidy and god mod verify in the Makefile
• Removed gopkg.toml and gopkg.lock
• Other fixes mentioned above
• go mod vendor

[codecov-commenter]

Codecov Report

Merging #148 into master will decrease coverage by 0.25%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #148      +/-   ##
==========================================
- Coverage   22.90%   22.65%   -0.26%     
==========================================
  Files          14       14              
  Lines         489      490       +1     
==========================================
- Hits          112      111       -1     
- Misses        376      378       +2     
  Partials        1        1              

Impacted Files	Coverage Δ
pkg/usage/ping.go	40.00% <0.00%> (-3.75%)	⬇️
pkg/usage/usage.go	0.00% <0.00%> (ø)
pkg/usage/versionset.go	0.00% <0.00%> (ø)
pkg/usage/googleanalytics.go	0.00% <0.00%> (ø)
pkg/client/k8s/v1alpha1/namespace.go	0.00% <0.00%> (ø)
pkg/common/kubernetes/client/client.go	83.33% <0.00%> (ø)

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[pawanpraka1]

looks good.