update git URLs (git -> https; gitea)

Change-Id: I0d7a9140ccbe5adecddde1901703e49243ee0b92
diff --git a/configure.ac b/configure.ac
index 4b67ea6..a45f2d4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -159,7 +159,7 @@
 	AM_PATH_PYTHON
 	AC_CHECK_PROG(OSMOTESTEXT_CHECK,osmotestvty.py,yes)
 	 if test "x$OSMOTESTEXT_CHECK" != "xyes" ; then
-		AC_MSG_ERROR([Please install git://osmocom.org/python/osmo-python-tests to run the VTY/CTRL tests.])
+		AC_MSG_ERROR([Please install https://gitea.osmocom.org/cellular-infrastructure/osmo-python-tests to run the VTY/CTRL tests.])
 	fi
 fi
 AC_MSG_CHECKING([whether to enable VTY/CTRL tests])