tests: do not set default OS

pkubatrh · omron93 · commit 4321c9e0dfd2 · 2017-11-28T08:53:24.000+01:00
diff --git a/test/pg-test-lib.sh b/test/pg-test-lib.sh
@@ -1,4 +1,3 @@
-: ${OS=centos7}
 DEBUG=false
 
 info  () { echo >&2 " * $*" ; }
