[patch] Bug fix on StreamGetObject API and DNS cache expiration / refactor net connection

[kpango]

Signed-off-by: kpango kpango@vdaas.org

Description:

add TLS handshake controls & more accurate host pass joining
use custom net dialer connection for k8s reconciliation.

This PR contains two bug fixes.

1. gateway-components passed the E2E test, but it turns out that there is a bug in the StreamGetObject handler, this bug has already been fixed in this PR, but I don't know why it passed E2E, so we need to research it later.
2. as we provided a DNS cache expiration daemon, but it was working without being invoked (DNS cache never expired...)　However, this is not a big problem, because if there is no connection at the moment of dialing into the cached DNS information, it will behave as if it is going to update the cached information again.

Related Issue:

How Has This Been Tested?:

Environment:

• Go Version: 1.15.7
• Docker Version: 19.03.8
• Kubernetes Version: 1.18.2
• NGT Version: 1.13.1

Types of changes:

• Bug fix [type/bug]
• New feature [type/feature]
• Add tests [type/test]
• Security related changes [type/security]
• Add documents [type/documentation]
• Refactoring [type/refactoring]
• Update dependencies [type/dependency]
• Update benchmarks and performances [type/bench]
• Update CI [type/ci]

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

Checklist:

• I have read the CONTRIBUTING document.
• I have checked open Pull Requests for the similar feature or fixes?
• I have added tests and benchmarks to cover my changes.
• I have ensured all new and existing tests passed.
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation accordingly.

[vdaas-ci]

[WARNING:INTCFG] Changes in interal/config may require you to change Helm charts. Please check.

[vdaas-ci]

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[github-actions]

🚫 [golangci] _{reported by reviewdog 🐶}
unnecessary trailing newline (whitespace)

[codecov]

Codecov Report

Merging #986 (91c1048) into master (2eb8668) will increase coverage by 0.02%.
The diff coverage is 30.79%.

@@            Coverage Diff             @@
##           master     #986      +/-   ##
==========================================
+ Coverage   14.45%   14.47%   +0.02%     
==========================================
  Files         492      494       +2     
  Lines       27906    28300     +394     
==========================================
+ Hits         4033     4096      +63     
- Misses      23635    23957     +322     
- Partials      238      247       +9     

Impacted Files	Coverage Δ
internal/config/discoverer.go	0.00% <0.00%> (ø)
internal/config/meta.go	0.00% <0.00%> (ø)
internal/config/tcp.go	14.63% <0.00%> (-0.76%)	⬇️
internal/db/nosql/cassandra/cassandra.go	95.83% <0.00%> (-1.63%)	⬇️
internal/errors/net.go	66.66% <0.00%> (-33.34%)	⬇️
internal/k8s/option.go	0.00% <0.00%> (ø)
internal/k8s/reconciler.go	0.00% <0.00%> (ø)
internal/net/grpc/client.go	0.00% <0.00%> (ø)
internal/net/grpc/option.go	0.00% <0.00%> (ø)
internal/net/grpc/pool/pool.go	0.00% <0.00%> (ø)
... and 21 more

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[kpango]

/changelog

[vdaas-ci]

[CHANGELOG] Please edit the following lines.

• [patch] Bug fix on StreamGetObject API and DNS cache expiration / refactor net connection (#986)
• Remove base docker image (#995)
• Use namespaced names for priorityclasses of new gateways (#992)
• Add E2E Chaos tests running on GitHub Actions (#899)
• Add zap logger to chart schema (#985)
• add test for internal/errors/runtime (#984)
• add test for internal/errors/tensorflow (#982)
• add test for internal/errors/unit (#979)
• update chatops permission (#990)
• 🤖 Automatically update k8s manifests (#981)