Add namespace to the serviceCluster in envoy based cell gateway

[nadundesilva]

Purpose

Add namespace to the serviceCluster in envoy based cell gateway.

Goals

Add namespace to the serviceCluster in envoy based cell gateway.

Approach

Add namespace to the serviceCluster in envoy based cell gateway.

User stories

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Release note

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Documentation

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Training

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Certification

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Marketing

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Automation tests

• Unit tests

  N/A

• Integration tests

  N/A

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes
• Ran FindSecurityBugs plugin and verified report? yes
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes

Samples

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Related PRs

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Migrations (if applicable)

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Test environment

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Learning

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[codecov-io]

Codecov Report

Merging #108 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff           @@
##           master    #108   +/-   ##
======================================
  Coverage    79.5%   79.5%           
======================================
  Files          38      38           
  Lines        2162    2162           
======================================
  Hits         1719    1719           
  Misses        409     409           
  Partials       34      34

Impacted Files	Coverage Δ
pkg/controller/gateway/resources/deployment.go	98.8% <100%> (ø)	:arrow_up:

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