Revert "enabling oracle tests on windows"

This reverts commit 2554b94.

Author: nvarscar

appveyor.yml

@@ -22,7 +22,7 @@ for:
         - image: Visual Studio 2017
     environment:
         mssql_instance: localhost\SQL2017
-        scenario: all
+        scenario: windows
     services:
       - mssql2017
       - mysql
@@ -31,7 +31,6 @@ for:
       - SET PATH=C:\Program Files\PostgreSQL\9.6\bin\;%PATH%
       - psql -c "CREATE USER sa WITH SUPERUSER PASSWORD 'Password12!';" -U postgres
       - ps: .\tests\appveyor.prep.ps1
-      - docker run --name dbops-oracle -d -p 1521:1521 -e ORACLE_ALLOW_REMOTE=true wnameless/oracle-xe-11g-r2
 
   - matrix:
       only: