Travis: Do not construct fake psql executable

This conflicts with enabling the PostgreSQL service (see ENSCORESW-3159)
and doesn't seem to be required even when the service is not enabled.

.travis.yml

@@ -14,13 +14,6 @@ env:
 
 sudo: false
 
-before_install:
-    - echo -e '#!/bin/bash\n\nperl '`which psql`' "$@"' > psql
-    - chmod +x psql
-    - export PATH=$PWD:$PATH
-    - ln -s /usr/share/perl5/PgCommon.pm modules/
-
-
 install:
     - cpanm -v --installdeps --notest .
     - cpanm -n Devel::Cover::Report::Coveralls