use valid syntax for creating tmpdir under linux

Change-Id: I73b22a7803ffcf08f6bd3f46147b46be33d718c2

Author: dhellmann

docs/source/history.rst

@@ -16,6 +16,7 @@ dev
 - Fix handling for project directory argument ``-a`` to
   :ref:`command-mkvirtualenv`, based on work by Xupeng Yun.
 - Dropped python 3.2 testing.
+- Updated test configuration so they work properly under Linux.
 
 4.1.1
 =====

tests/setup.sh

@@ -6,7 +6,7 @@
 # export WORKON_HOME="$(echo ${tmplocation}/WORKON_HOME.$$ | sed 's|//|/|g')"
 # export PROJECT_HOME="$(echo ${tmplocation}/PROJECT_HOME.$$ | sed 's|//|/|g')"
 
-export WORKON_HOME=$(mktemp -d -t "WORKON_HOME.$$")
-export PROJECT_HOME=$(mktemp -d -t "PROJECT_HOME.$$")
+export WORKON_HOME=$(mktemp -d -t "WORKON_HOME.XXXX.$$")
+export PROJECT_HOME=$(mktemp -d -t "PROJECT_HOME.XXXX.$$")
 
 #unset HOOK_VERBOSE_OPTION