Automated test case for istioctl install/uninstall

[carolynhu]

WIP, needs to fix istio.io site first to make verify test pass.

[ ] Configuration Infrastructure
[ ] Docs
[ ] Installation
[ ] Networking
[ ] Performance and Scalability
[ ] Policies and Telemetry
[ ] Security
[ ] Test and Release
[ ] User Experience
[ ] Developer Infrastructure

[istio-testing]

@carolynhu: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
lint_istio.io	fe4c088	link	/test lint_istio.io
doc.test.profile_default_istio.io	fe4c088	link	/test doc.test.profile_default_istio.io
doc.test.profile_demo_istio.io	fe4c088	link	/test doc.test.profile_demo_istio.io
doc.test.profile_none_istio.io	fe4c088	link	/test doc.test.profile_none_istio.io
doc.test.multicluster_istio.io	fe4c088	link	/test doc.test.multicluster_istio.io

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[frankbu]

needs to fix istio.io site first to make verify test pass.

@carolynhu The changes you need to make in the doc (index.md) to improve/support the test should be done in the same PR (this one).

[frankbu]

Fix bad variable syntax, here and throughout the test.

Suggested change

	_verify_like snip_check_whats_installed_1 snip_check_whats_installed_1_out
	_verify_like snip_check_whats_installed_1 "$snip_check_whats_installed_1_out"

[carolynhu]

needs to fix istio.io site first to make verify test pass.

@carolynhu The changes you need to make in the doc (index.md) to improve/support the test should be done in the same PR (this one).

got it!

[craigbox]

Any interest in coming back to this, @carolynhu ?

If not, @frankbu, do you think it worth fixing up, or is it out of date due to the Operator not being the preferred method any more?