RFR (S): JDK-8222778: Packaging Tool (JEP 343) on Linux/AArch64

[Dmitry Chuyko]

Hello,

Please review a small patch that mostly fixes jpackage test for Linux 
aarch64 and also arm,x86,power. It is prepared for 'JDK-8200758-branch' 
branch of open 'sandbox' repo.

There are few parts:

1. LinuxPlatform.cpp and IniFile.cpp got small fixes for compiler warnings.

2. LinuxDebBundler.getArch() now maps only x86_64 to amd64, x86 is still 
mapped to i386, and other archs map to themselves.

3. In tests, new method getRpmArch() was added to linux/base/Base.java, 
it maps JVMs os.arch to default rpmbuild arch. Multiple tests were 
modified to use that method instead of "x86_64" in rpm file name. Some 
timeouts were increased.

bug: https://bugs.openjdk.java.net/browse/JDK-8222778

webrev: http://cr.openjdk.java.net/~dchuyko/8222778/webrev.00/

testing: test/jdk/tools/jpackage jtreg tests pass on Ubuntu 16.04 with 
rpmbuild on x86_64, aarch64, arm, x86 and power, except 
deb/MaintainerTest (fails everywhere similarly to x86_64 because of 
extra "Unknown" name in email).

I didin't cover s390 as we in BellSoft currently don't build on that 
arch. On typical armv7 hw increased or default timeouts are still too 
low, while they are fine for some relatively weak aarch64 machines. Deb 
tests run especially slow because of dpkg-deb itself. I used 
"force-unsafe-io" option in /etc/dpkg/dpkg.cfg, it does reduce packaging 
time but still not enough to have really fast tests.

-Dmitry