admin: fix /server_info hot restart version (#8022)
admin: fix /server_info hot restart version (#8022)

Signed-off-by: Matt Klein <mklein@lyft.com>

Mirrored from https://github.com/envoyproxy/envoy @ 5c2b34bdefb8ef6d3bd8426d289128847c0768b2

lyft/envoy-api,lyft/envoy-api,lyft/envoy-api