Update Jakarta README.md - Remove the check dependency on ping.

[arturmartins]

Instead of using ping to test the system's standard DNS resolution process, I propose using getent instead since it doesn't require communication with the outside world.

The getent command with the hosts argument utilises the system's libc resolver to perform name lookups based on the configuration specified in /etc/nsswitch.conf. This approach ensures the testing of the system's actual name resolution pathway, as would be used by most applications and tools on the system that rely on DNS resolution.

I tested the script in the Jakarta VM and it worked as expected.