Merge #288: use a single-use temp name for integration test dir

e3dafb2 use a single-use temp name for integration test dir (z8674558)

Pull request description:

  Closes #287

ACKs for top commit:
  sanket1729:
    utACK e3dafb2
  apoelstra:
    ACK e3dafb2

Tree-SHA512: 5c2bf427803370d4a9c6c23dbd2b32500694a5b6d1032252810d97582d7db3c030b4d57dd009b85d59103f4f2433c13235645957b92f370e82f396c376bbd4fc

Author: sanket1729

integration_test/run.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
 
-TESTDIR=/tmp/rust_miniscript_test
+RAND_DIR=$(head -c 4 </dev/urandom | xxd -p)
+TESTDIR=/tmp/"rust_miniscript_test_$RAND_DIR"
 
 rm -rf ${TESTDIR}
 mkdir -p ${TESTDIR}/1