Fix for test/hotspot/jtreg/runtime/8176717/TestInheritFD.java on Alpine Linux

[Alexander Scherbatiy]

Hello,

The test test/hotspot/jtreg/runtime/8176717/TestInheritFD.java fails on 
Alpine Linux because "lsof" command from busybox does not support "-p" 
option and just list all open files for all process (see discussion [1])

The proposed fix checks not only that result of "lsof -f" command 
contains the GC log file but also that it has the child pid:

http://cr.openjdk.java.net/~alexsch/portola/TestInheritFD/webrev.00/

This does not work work for Solaris "pfiles -F" so the additional flag 
is added that the pid is only checked for "lsof".

Another proposed options was to check open files for a process by "ls -l 
/proc/$$/fd". It seems it also is not directly applied for Solaris.

[1] https://www.openwall.com/lists/musl/2020/02/08/3

Thanks,

Alexandr.