RFR(S): 8222769: [TESTBUG] TestJFRNetworkEvents should not rely on hostname command

[Erik Gahlin]

Looks good.

An alternative to avoid the matchFound variable is to move the check 
into a separate method, for example assertLocalAddress(String) and 
return if a match is found.  That said, I'm fine it as is.

Thanks
Erik

> Here is the updated webrev: 
> http://cr.openjdk.java.net/~mseledtsov/8222769.01/
>
>
> On 4/25/19 6:38 PM, mikhailo.seledtsov at oracle.com wrote:
>> Thank you Leonid,
>>
>>
>> On 4/25/19 6:25 PM, Leonid Mesnik wrote:
>>> Hi
>>>
>>> The overall fix looks food. But I expect that there are might be 
>>> different docker environments.
>>> Would not be more robust to verify that address exist in 
>>> getLocalIp() list and fails if not?
>> Sounds good. I will update the code to match the address reported by 
>> JFR to all the addresses returned by getLocalIp(). If at least a 
>> single match found, test continues. If not, test fails.
>>
>> Misha
>>>
>>> Leonid
>>>
>>>> On Apr 25, 2019, at 5:51 PM, mikhailo.seledtsov at oracle.com wrote:
>>>>
>>>> Please review this change that uses a better platform independent 
>>>> way of obtaining IP address inside a docker container.
>>>> This test worked for Oracle Linux, but did not work on Fedora, 
>>>> which is now fixed.
>>>> The code for obtaining IP address in getLocalIp() was contributed 
>>>> by Severin, thank you Severin.
>>>>
>>>>      JBS: https://bugs.openjdk.java.net/browse/JDK-8222769
>>>>      Webrev: http://cr.openjdk.java.net/~mseledtsov/8222769.00/
>>>>      Testing:
>>>>          Ran the affected test on Linux-x64 (Oracle Linux 7.3, 7.6) 
>>>> - Passed
>>>>
>>>>
>>>> Thank you,
>>>> Misha
>>>>
>>
>