sanitycheck: outdir should not be relative to ZEPHYR_BASE

We should leave ZEPHYR_BASE alone and create the test output wherever
we are running.
This will support running sanitycheck on test roots other than zephyr's
main git repo.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
diff --git a/scripts/sanitycheck b/scripts/sanitycheck
index 3f90a73..8c82229 100755
--- a/scripts/sanitycheck
+++ b/scripts/sanitycheck
@@ -2532,8 +2532,9 @@
         "--footprint-threshold=0")
     parser.add_argument(
         "-O", "--outdir",
-        default="%s/sanity-out" % ZEPHYR_BASE,
+        default="%s/sanity-out" % os.getcwd(),
         help="Output directory for logs and binaries. "
+        "Default is 'sanity-out' in the current directory. "
         "This directory will be deleted unless '--no-clean' is set.")
     parser.add_argument(
         "-n", "--no-clean", action="store_true",