enhance(dep): adds dep check in travis

[ashishranjan738]

Signed-off-by: Ashish Ranjan ashishranjan738@gmail.com

What type of PR is this?
/kind feature

What this PR does / why we need it:
This commit adds dep check in travis which will allow catching broken dependencies PR.

Which issue(s) this PR fixes:

Fixes #54

Special notes for your reviewer:
Merge this PR after #64 as curretly the vendor packages are not in sync and the PR #64 contains the changes of dep ensure.

Release note:

adds dep check in travis

[andyzhangx]

would you also fix this failure in this PR:

Verifying dep check
# Gopkg.lock is out of sync:
github.com/Azure/go-autorest/autorest/to: imported or required, but missing from Gopkg.lock's input-imports
# vendor is out of sync:
google.golang.org/api: hash of vendored tree not equal to digest in Gopkg.lock
k8s.io/kubernetes: hash of vendored tree not equal to digest in Gopkg.lock
The command "hack/verify-all.sh" exited with 1.

[ashishranjan738]

would you also fix this failure in this PR:

Verifying dep check
# Gopkg.lock is out of sync:
github.com/Azure/go-autorest/autorest/to: imported or required, but missing from Gopkg.lock's input-imports
# vendor is out of sync:
google.golang.org/api: hash of vendored tree not equal to digest in Gopkg.lock
k8s.io/kubernetes: hash of vendored tree not equal to digest in Gopkg.lock
The command "hack/verify-all.sh" exited with 1.

@andyzhangx fixed

[andyzhangx]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx, ashishranjan738

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[andyzhangx]

thanks, could you also fix it in azure file driver: kubernetes-sigs/azurefile-csi-driver#39, thanks.