Improve tests a bit

[mogren]

Issue #, if available: Follow up to #576

Description of changes:

• Add unit tests for file copying
• Change sleep timeouts from 5 to 0 seconds (Saves over 100 seconds when running tests)
• Update makefile to run tests for all packages
• Add vendor folder to .dockerignore

Added test:

docker run -e GO111MODULE=on \
		amazon-k8s-cni-test:latest make unit-test
GOOS=linux CGO_ENABLED=1 go test -v -cover github.com/aws/amazon-vpc-cni-k8s github.com/aws/amazon-vpc-cni-k8s/client/health-check github.com/aws/amazon-vpc-cni-k8s/cni-metrics-helper github.com/aws/amazon-vpc-cni-k8s/cni-metrics-helper/metrics github.com/aws/amazon-vpc-cni-k8s/ipamd github.com/aws/amazon-vpc-cni-k8s/ipamd/datastore github.com/aws/amazon-vpc-cni-k8s/pkg/apis/crd/v1alpha1 github.com/aws/amazon-vpc-cni-k8s/pkg/awsutils github.com/aws/amazon-vpc-cni-k8s/pkg/awsutils/mocks github.com/aws/amazon-vpc-cni-k8s/pkg/cninswrapper github.com/aws/amazon-vpc-cni-k8s/pkg/cninswrapper/mock_ns github.com/aws/amazon-vpc-cni-k8s/pkg/cninswrapper/mocks github.com/aws/amazon-vpc-cni-k8s/pkg/ec2metadata github.com/aws/amazon-vpc-cni-k8s/pkg/ec2metadata/mocks github.com/aws/amazon-vpc-cni-k8s/pkg/ec2metadatawrapper github.com/aws/amazon-vpc-cni-k8s/pkg/ec2metadatawrapper/mocks github.com/aws/amazon-vpc-cni-k8s/pkg/ec2wrapper github.com/aws/amazon-vpc-cni-k8s/pkg/ec2wrapper/mocks github.com/aws/amazon-vpc-cni-k8s/pkg/eniconfig github.com/aws/amazon-vpc-cni-k8s/pkg/eniconfig/mocks github.com/aws/amazon-vpc-cni-k8s/pkg/grpcwrapper github.com/aws/amazon-vpc-cni-k8s/pkg/grpcwrapper/mocks github.com/aws/amazon-vpc-cni-k8s/pkg/httpwrapper github.com/aws/amazon-vpc-cni-k8s/pkg/httpwrapper/mocks github.com/aws/amazon-vpc-cni-k8s/pkg/ioutilwrapper github.com/aws/amazon-vpc-cni-k8s/pkg/ioutilwrapper/mocks github.com/aws/amazon-vpc-cni-k8s/pkg/ipwrapper github.com/aws/amazon-vpc-cni-k8s/pkg/ipwrapper/mocks github.com/aws/amazon-vpc-cni-k8s/pkg/k8sapi github.com/aws/amazon-vpc-cni-k8s/pkg/k8sapi/mocks github.com/aws/amazon-vpc-cni-k8s/pkg/netlinkwrapper github.com/aws/amazon-vpc-cni-k8s/pkg/netlinkwrapper/mock_netlink github.com/aws/amazon-vpc-cni-k8s/pkg/netlinkwrapper/mocks github.com/aws/amazon-vpc-cni-k8s/pkg/netlinkwrapper/mocks_link github.com/aws/amazon-vpc-cni-k8s/pkg/networkutils github.com/aws/amazon-vpc-cni-k8s/pkg/networkutils/mocks github.com/aws/amazon-vpc-cni-k8s/pkg/nswrapper github.com/aws/amazon-vpc-cni-k8s/pkg/nswrapper/mocks github.com/aws/amazon-vpc-cni-k8s/pkg/publisher github.com/aws/amazon-vpc-cni-k8s/pkg/publisher/mock_publisher github.com/aws/amazon-vpc-cni-k8s/pkg/rpcwrapper github.com/aws/amazon-vpc-cni-k8s/pkg/rpcwrapper/mocks github.com/aws/amazon-vpc-cni-k8s/pkg/typeswrapper github.com/aws/amazon-vpc-cni-k8s/pkg/typeswrapper/mocks github.com/aws/amazon-vpc-cni-k8s/pkg/utils github.com/aws/amazon-vpc-cni-k8s/pkg/utils/logger github.com/aws/amazon-vpc-cni-k8s/pkg/utils/ttime github.com/aws/amazon-vpc-cni-k8s/pkg/utils/ttime/mocks github.com/aws/amazon-vpc-cni-k8s/plugins/routed-eni github.com/aws/amazon-vpc-cni-k8s/plugins/routed-eni/driver github.com/aws/amazon-vpc-cni-k8s/plugins/routed-eni/driver/mocks github.com/aws/amazon-vpc-cni-k8s/rpc github.com/aws/amazon-vpc-cni-k8s/rpc/mocks github.com/aws/amazon-vpc-cni-k8s/scripts
=== RUN   Test_copyFileContents
=== RUN   Test_copyFileContents/Missing_file
=== RUN   Test_copyFileContents/Copy_executable
=== RUN   Test_copyFileContents/Copy_regular-file
1565208719844147400 [Debug] Copied file from "./testdata/executable" to "/tmp/executable"
--- PASS: Test_copyFileContents (0.01s)
    --- PASS: Test_copyFileContents/Missing_file (0.00s)
    --- PASS: Test_copyFileContents/Copy_executable (0.01s)
    --- PASS: Test_copyFileContents/Copy_regular-file (0.00s)   

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[micahhausler]

LGTM