Enable python tests for Native Windows

1) Multiplatorm support for devnull
2) Fixed a bug in the handling of cache files
3) Deleted run-bitcoin-cli as no longer needed

qa/pull-tester/rpc-tests.sh

@@ -5,8 +5,8 @@ CURDIR=$(cd $(dirname "$0"); pwd)
 # Get BUILDDIR and REAL_BITCOIND
 . "${CURDIR}/tests-config.sh"
 
-export BITCOINCLI=${BUILDDIR}/qa/pull-tester/run-bitcoin-cli
 export BITCOIND=${REAL_BITCOIND}
+export BITCOINCLI=${REAL_BITCOINCLI}
 
 #Run the tests
 

qa/pull-tester/run-bitcoin-cli

@@ -1,13 +0,0 @@
-#!/bin/bash
-
-# This is a thin wrapper around bitcoin-cli that strips the Windows-style EOLs
-# from the output if present. It is necessary when using bitcoin-cli.exe on
-# Linux since shells will interpret the line-endings as part of the result.
-
-CURDIR=$(cd $(dirname "$0"); pwd)
-# Get BUILDDIR and REAL_BITCOIND
-
-# Grab the value of $REAL_BITCOINCLI which may be bitcoin-cli.exe.
-. "${CURDIR}/tests-config.sh"
-
-"${REAL_BITCOINCLI}" "$@" | sed 's/\r//'