tests/phabricator/phabread-empty-drev.json

sharesafe: add functionality to automatically downgrade shares

Reasoning is same as previous patch which adds automatic upgrade support.

Downgrade is required as if automatic upgrade is enabled, all shares upgrade and
then source repository downgrades, shares won't work. We need to downgrade them.

Differential Revision: https://phab.mercurial-scm.org/D9680

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    "version": 1, 
    "interactions": [
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            "request": {
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                "method": "POST", 
                "headers": {
                    "accept": [
                        "application/mercurial-0.1"
                    ], 
                    "host": [
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                    ], 
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                    ], 
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                    ], 
                    "content-type": [
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                    ]
                }, 
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            }, 
            "response": {
                "status": {
                    "code": 200, 
                    "message": "OK"
                }, 
                "headers": {
                    "x-content-type-options": [
                        "nosniff"
                    ], 
                    "x-frame-options": [
                        "Deny"
                    ], 
                    "referrer-policy": [
                        "no-referrer"
                    ], 
                    "server": [
                        "Apache/2.4.10 (Debian)"
                    ], 
                    "cache-control": [
                        "no-store"
                    ], 
                    "content-type": [
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                    ], 
                    "transfer-encoding": [
                        "chunked"
                    ], 
                    "expires": [
                        "Sat, 01 Jan 2000 00:00:00 GMT"
                    ], 
                    "x-xss-protection": [
                        "1; mode=block"
                    ], 
                    "date": [
                        "Thu, 05 Mar 2020 16:19:23 GMT"
                    ], 
                    "strict-transport-security": [
                        "max-age=0; includeSubdomains; preload"
                    ]
                }, 
                "body": {
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