Create clone map outside workspace in zuul-.*-prep

Since zuul-cloner needs a clone map to tell it to clone the tested
project as the job workspace, and git won't clone into a non-empty
directory, the clone map needs to be written outside the workspace.
Use a temporary file, and clean it up with an exit trap in case this
macro is used on long-lived job workers.

Change-Id: I40ebd3dbb9123edce973d8ddaa06f0f804e16c56

jenkins/jobs/macros.yaml

@@ -26,12 +26,17 @@
     builders:
       - shell: |
           #!/bin/bash -xe
-          cat > clonemap.yaml << EOF
+          CLONEMAP=`mktemp`
+          function cleanup {
+              rm -f $CLONEMAP
+          }
+          trap cleanup EXIT
+          cat > $CLONEMAP << EOF
           clonemap:
             - name: $ZUUL_PROJECT
               dest: .
           EOF
-          /usr/zuul-env/bin/zuul-cloner -m clonemap.yaml --cache-dir /opt/git \
+          /usr/zuul-env/bin/zuul-cloner -m $CLONEMAP --cache-dir /opt/git \
               git://git.openstack.org $ZUUL_PROJECT
 
 - builder:
@@ -39,7 +44,12 @@
     builders:
       - shell: |
           #!/bin/bash -xe
-          cat > clonemap.yaml << EOF
+          CLONEMAP=`mktemp`
+          function cleanup {
+              rm -f $CLONEMAP
+          }
+          trap cleanup EXIT
+          cat > $CLONEMAP << EOF
           clonemap:
             - name: $ZUUL_PROJECT
               dest: .
@@ -51,7 +61,7 @@
           if [ "$BRANCH_OVERRIDE" != "default" ] ; then
               export ZUUL_BRANCH=$BRANCH_OVERRIDE
           fi
-          /usr/zuul-env/bin/zuul-cloner -m clonemap.yaml --cache-dir /opt/git \
+          /usr/zuul-env/bin/zuul-cloner -m $CLONEMAP --cache-dir /opt/git \
               git://git.openstack.org $ZUUL_PROJECT
 
 - builder: