Use minio for integration testing.

ScalityS3 has not received any maintenance in years and is slow to start which is bad for testing.  Replace it with minio which starts quickly and ships as a single executable or a tiny container.

Minio has stricter limits on allowable characters but should still provide enough coverage to show that our encoding is working correctly.

This commit also includes the upgrade to openssl 1.1.1 in the Ubuntu 18.04 container.

test/patch/debian-package.patch

@@ -0,0 +1,23 @@
+--- control
++++ control
+@@ -4,11 +4,9 @@
+ Maintainer: Debian PostgreSQL Maintainers <team+postgresql@tracker.debian.org>
+ Uploaders: Adrian Vondendriesch <adrian.vondendriesch@credativ.de>
+ Build-Depends: debhelper (>= 9),
+-               libio-socket-ssl-perl,
+                libperl-dev,
+                libssl-dev,
+                libxml-checker-perl,
+-               libxml-libxml-perl,
+ 	       libxml2-dev,
+                txt2man,
+ 	       zlib1g-dev
+@@ -24,7 +22,7 @@
+          ${misc:Depends},
+          ${perl:Depends},
+          ${shlibs:Depends}
+-Suggests: libio-socket-ssl-perl, libxml-libxml-perl, pgbackrest-doc
++Suggests: pgbackrest-doc
+ Description: Reliable PostgreSQL Backup & Restore
+  pgBackRest is a simple, reliable backup and restore system for PostgreSQL
+  that can seamlessly scale up to the largest databases and workloads.

test/patch/rhel-package.patch

@@ -0,0 +1,10 @@
+--- pgbackrest.spec
++++ pgbackrest.spec
+@@ -10,7 +10,6 @@
+ Source0:	https://github.com/pgbackrest/pgbackrest/archive/release/%{version}.tar.gz
+ Source1:	pgbackrest-conf.patch
+ BuildRoot:	%{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
+-Requires:	perl-XML-LibXML perl-IO-Socket-SSL
+ %if 0%{?rhel} && 0%{?rhel} <= 6
+ Requires:	perl-parent perl-JSON perl-Time-HiRes
+ %else