Add new package: dnstracer (#18933)

* Add new package: dnstracer

* refine package class

var/spack/repos/builtin/packages/dnstracer/package.py

@@ -0,0 +1,29 @@
+# Copyright 2013-2020 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class Dnstracer(Package):
+    """Dnstracer determines where a given Domain Name Server gets
+    its information from, and follows the chain of DNS servers back to
+    the servers which know the data."""
+
+    homepage = "https://github.com/Orc/dnstracer"
+    git      = "https://github.com/Orc/dnstracer.git"
+
+    version('master', branch='master')
+
+    phases = ['configure', 'build', 'install']
+
+    def configure(self, spec, prefix):
+        configure = Executable('./configure.sh')
+        configure('--prefix={0}'.format(prefix))
+
+    def build(self, spec, prefix):
+        make()
+
+    def install(self, spec, prefix):
+        make('install')