Upgrade OpenSSL to 1.1.1g for `alpine` flavor (for CVE-2020-1967).

Upgrade OpenSSL to 1.1.0l and 1.1.1f for built-from-source flavors

Add RESTY_OPENSSL_PATCH_VERSION and RESTY_OPENSSL_URL_BASE build args

Empty commit to force Travis tag build

Fixup envsubst install on `alpine-fat`

Add amzn2 upstream flavor based on centos

Remove `VOLUME` directive and just `mkdir /var/run/openresty` (openre…

…sty#128)

Release 1.15.8.2-4 and update AUTHORS

don't move temp dirs for windows

Backout logging changes (openresty#119)

Release version 1.15.8.1-4