RFR 8085919: OperatingSystemMXBean/TestTotalSwap.java failure : Total Swap Space figures mismatch

[Jaroslav Bachorik]

Please, review the following test change

Issue : https://bugs.openjdk.java.net/browse/JDK-8085919
Webrev: http://cr.openjdk.java.net/~jbachorik/8085919/webrev.00

The test fails on embedded machines with 'yocto' flavour of OS 
installed. For some reason the 'free -b' command ignores the request to 
report sizes in bytes and does report in kilobytes.

I've changed the test to expect this behaviour (when the OS version 
string contains 'yocto') and in case the expected and reported total 
swap size are different to try conversion from kilobytes to bytes and 
check again.

Thanks,

-JB-