Fix searchpath and module location for pg_rewind and ssl TAP tests

The modules RewindTest.pm and ServerSetup.pm are really only useful for
TAP tests, so they really belong in the TAP test directories. In
addition, ServerSetup.pm is renamed to SSLServer.pm.

The test scripts have their own directories added to the search path so
that the relocated modules will be found, regardless of where the tests
are run from, even on modern perl where "." is no longer in the
searchpath.

Discussion: https://postgr.es/m/e4b0f366-269c-73c3-9c90-d9cb0f4db1f9@2ndQuadrant.com

Backpatch as appropriate to 9.5

src/test/ssl/t/001_ssltests.pl

@@ -3,9 +3,14 @@ use warnings;
 use PostgresNode;
 use TestLib;
 use Test::More;
-use ServerSetup;
+
 use File::Copy;
 
+use FindBin;
+use lib $FindBin::RealBin;
+
+use SSLServer;
+
 if ($ENV{with_openssl} eq 'yes')
 {
 	plan tests => 71;

src/test/ssl/t/002_scram.pl

@@ -5,9 +5,14 @@ use warnings;
 use PostgresNode;
 use TestLib;
 use Test::More;
-use ServerSetup;
+
 use File::Copy;
 
+use FindBin;
+use lib $FindBin::RealBin;
+
+use SSLServer;
+
 if ($ENV{with_openssl} ne 'yes')
 {
 	plan skip_all => 'SSL not supported by this build';

src/test/ssl/t/SSLServer.pm

@@ -24,7 +24,7 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package ServerSetup;
+package SSLServer;
 
 use strict;
 use warnings;