Merge 2.6.x branch to master branch

[VimukthiPerera]

Purpose

Resolves #62, resolves #64, resolves #65, resolves #70, resolves #72, resolves #73, resolves #74, resolves #78

Goals

Merge 2.6.x branch to master branch

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes
• Ran FindSecurityBugs plugin and verified report? no
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes

Related PRs

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Test environment

Ubuntu 18.04 PCF Ops Manager v2.4-build.131 tile version 12.0.8 bosh version 5.3.1-8366c6fd-2018-09-25T18:25:51Z pcf version 12.0.8