This will be used in the ESX storage driver in order to handle
the DatastoreInfo type and inheriting types properly.

Generate almost all SOAP method mapping code.

Update the driver code to use the complete paramater list of some methods
that had parameters skipped before.

Improve the ESX_VI__METHOD marco to do automatic output deserialization
based on output occurrence. Also incorporate automatic _this binding and
output pointer check.

Fix invalid code generating in esx_vi_generator.py regarding deep copy
types that contain enum properties.

Add strptime and timegm to bootstrap.conf. Both are used to convert a
xsd:dateTime to calendar time.

Add a testcase of the xsd:dateTime conversion.

The Python script generates the mappings based on the type descriptions
in the esx_vi_generator.input file.

This also improves the inheritance handling and allows to get rid of the
ugly, inflexible, and error prone _base/_super approach. Now every struct
that represents a SOAP type contains a _type member, that allows to
recreate C++-like dynamic dispatch for "method" calls in C.