[rfc][icedtea-web] spawning linux jvm in rust lunchers

[Jiri Vanek]

Currently doing nothing, just resending input arguments and settng path to java binary.
Still the whole approach is supposed to be final.

2018-10-02  Jiri Vanek <jvanek at redhat.com>
	* rust-launcher/src/jvm_from_properties_resolver.rs: (TestLogger) testing impl of Os implementing 
new method by doing nothing
	* rust-launcher/src/main.rs: (main) calling new os.spawn_java_process with inut arguments without 
first one (pgm path)
	* rust-launcher/src/os_access.rs: (Os) declared new method ofspawn_java_process. (Linux) 
implementing it by spawn
	* rust-launcher/src/utils.rs: added and tested new methods to slice out first member of vector and 
to cut first param  of  input arguments


-- 
Jiri Vanek
Senior QE engineer, OpenJDK QE lead, Mgr.
Red Hat Czech
jvanek at redhat.com    M: +420775390109
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