update envoy sha for sni

[ijsnellf]

What this PR does / why we need it:
Updates Envoy SHA so that SNI is available. SNI support was merged here: envoyproxy/envoy#3217

I am not sure about the update process for istio/proxy, so please double check this PR.

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:

Release note:

[istio-testing]

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[istio-testing]

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

Test name	Commit	Details	Rerun command
prow/proxy-presubmit-tsan.sh	c26ad9d	link	/test proxy-presubmit-tsan
prow/proxy-presubmit-asan.sh	c26ad9d	link	/test proxy-presubmit-asan
prow/proxy-presubmit.sh	c26ad9d	link	/test proxy-presubmit

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[ijsnellf]

Looks like it isn't as easy as updating the SHA, unfortunately. @lizan, does this look like something I can handle easily, or will it require code changes?

[lizan]

It looks like it is due to the change to method signature of sendLocalReply, so the code change should be easy. Though if you're not familiar with the code base, someone from proxy can handle it.

[ijsnellf]

I can give it a try, but it would probably make more sense for someone with familiarity with the code base to make the changes.

[rlenglet]

#1758 did those changes but was closed before merging.

[qiwzhang]

Replace it with #1759