update git URLs (git -> https; gitea)

Change-Id: I56d19d28078c6e8a381dc155ca1001d39621ef1d
diff --git a/configure.ac b/configure.ac
index 353fc96..560827f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -150,7 +150,7 @@
 	fi
 	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])