VMware Infrastructure Perl Toolkit Code

* VILib.pm

Some arg processing changes

- Disable auto abbreviations of long arguments.
This makes -<single-char> unambiguous.
- Support a new field 'alias' in the opt hash for specifying
alternative ways of specifying an argument.

* VIStub.pm

- Fix bug in the validation code in build_arg_string.

Move hostops over to use VILib, simplify the operation dispatch code.

Convert a bunch of samples to use VILib.

Good ol' use strict/use warnings: need to look before we leap, even for
trace information.

1. fixes primitive return from method invocations. Still to-do is a boolean 'optimization' case where 'true/false' are morphed into 1/0.

getpwuid isn't supported on Windows.

1. namespace rename from VIM3 to VIM2
2. Removed VIM3 directory from runtime/stub modules

Added VILib, a utility library to simplify script-writing. Currently
contains two packages: Util, which provides general utility methods, and
Opts, which does parameter processing.

Updated datacenterlisting.pl to demonstrate the use of VILib. We should
eventually move most or all of our sample scripts over, but I want to
let it gel a bit first.

Testing done: Built and installed the module; ran datacenterlisting.pl
with various combinations of command-line arguments, environment
variables, and config files, and verified that the expected options took
precedence when more than one was specified. Tried both
username/password and saved session.

Arg checking for find_entity_view* calls

fix typo 'being_entity'