Fix tests failing on windows

The command `ping 1.1.1.1 -n 1 -w 5000` sends only one packet to the
remote address and might finish before the configured timeout of 10ms
which makes some tests to fail. Moreover, pinging 1.1.1.1 requires the
host (which can be the CI build server) to have internet connection.
This command can also fail if there is no internet connection which
makes some tests (expecting the command to succeed) to fail too.

This commit uses the command `ping 127.0.0.1` which does not require
an internet connection and which will, by default [1], send 4 packets
and wait for a timeout of 4 seconds for each request. This should take
more time than the configured timeout of 10ms.

Resolves BATCH-2722

[1]: https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/ping