[rfc][icedtea-web]detecting jre in rust lunchers

[Jiri Vanek]

As agreed somewhen around October, this patch is enhancing new rust binaries to detect jre:
Fallbacking as follow:
  - from properties (user; legacy user; global; legacy global)
  - from java home
  - from registry(win only)
  - hardcoded (linux/cygwinonly)


I abandoned original regexes, as to use dependencies without cargo (as agreed with Alex)  is 
"human-impossible". If we eve rturn to deps, Cargo will take it nice place here. Tat will evolve 
from windows part of implementation. If we move to cargo, Iwill change the proeprty split from swtch 
to regex.

The linux x windows specific backends are not distinguished here - although many can be currently 
reused - Also that will evolve.

2018-02-12  Jiri Vanek <jvanek at redhat.com>
	* Makefile.am: building jvm_from_properties and os_access. Using them to build launchers.
	* rust-launcher/jvm_from_properties.rs: new file. library to find various ITW properties files and 
check, parse proeprties form it, and find jre one if possible
	* rust-launcher/os_access.rs:  new file. trait for current os-depndent parts.  Contains current 
linux implementation
	* rust-launcher/launchers.rs: now tries to locate the find jre as originally done in sh/bat 
lunchers - from properties (user; legacy user; global; legacy global), from JAVA_HOME, from 
registry(win/cygwin only), hardcoded (linux/cygwinonly)

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