tests/autotest_regression.py: do not depend on wget

The JeOS image itself has no wget preinstalled, and other images
that could be used with this may share the same characteristic.

So, use plain python (and ugly command line) to download the
installer script.
Signed-off-by: NCleber Rosa <crosa@redhat.com>

tests/autotest_regression.py

@@ -49,9 +49,16 @@ def run_autotest_regression(test, params, env):
 
     step1 = "autotest-server-install"
     try:
+        installer_file = "install-autotest-server.sh"
+        installer_url = ("https://raw.github.com/autotest/autotest/master"
+                         "/contrib/%s" % installer_file)
+
         # Download the install script and execute it
-        download_cmd = ("wget https://raw.github.com/autotest/autotest/master"
-                        "/contrib/install-autotest-server.sh")
+        download_cmd = ("python -c 'from urllib2 import urlopen; "
+                        "r = urlopen(\"%s\"); "
+                        "f = open(\"%s\", \"w\"); "
+                        "f.write(r.read())'" % (installer_url,
+                                                installer_file))
         session_server.cmd(download_cmd)
         permission_cmd = ("chmod +x install-autotest-server.sh")
         session_server.cmd(permission_cmd)