Cleaned cross-compile configure script.

Trying to remove ambiguity and not used environment variables.
Removed .zin and .zdist files.

From now will maintain original "pre-config"  files without duplicating. If we 
need some change just modify them, there is no need to keep original versions.
Disable build host python.

We assume build environment already have python installed. Anyway,
it's only needed for 'install' phase.
Left pgen build untouched for now. First, it's object files are included in 
libpython.a which may be needed. Next, no reasonable substitute is found.
Cleaning build scripts.
Replace compiling python with host python.

We're going not to compile python for host. It's only needed
for shared build and setup/install phases.
Assume we already have host python which could be
invoked to do installation (no shared build, anyway).
Fixes zerovm/zpython2#1.

Disabling shared modules build and install broke `exec_prefix`
directory structure creating. It lead to broken python installation
during python runtime configuration step.

Python uses `lib-dynload` as landmark for detecting `exec_prefix`.
Now fixing it.
Replaced bunch of build scripts with one.

Get rid of separate configure/compile/rebuild scripts in favour
of one: 2build_zpython.sh.

Building zpython2 has now only 2 phases: building pgen and
compiling python itself.
Merge pull request #2 from rampage644/master

Build process + fixed issue#1
Removed `chdir` ad-hoc implementation.

It is not needed due to implementation in zrt project.
Added script for testing python distribution.

File tests.txt contains all test that could be found under Lib/test/ directory.
It includes every test beginning with `test_` as regrtest.py does. Only explicitly
unsupported modules are exluded (see `status.md`).

3test.sh is simple python script that runs `python -mtest.regrtest test_name`
for every test.

It supposed to be replaced in future with regrtest module itself. just waiting
until `os.listdir()` issue is resolved and some spare time.
Marked some tests from python regression test suite as 'skipped'.

Some tests use features not supported under ZeroVM, such as pipes,
subprocessing. These tests are not supposed to pass, so mark them to be
skipped.

We have platform define as "linux2-zvm" and using this condition to check
if tests should be skipped.

This will make tests pass. Next step is to rewrite some of them. This would 
be done outside python regression test suite.
Updated status file.
Refactoring

Moved with() block outside main cycle to make test list more flexible.
Test script change.

Added some argument parsing: now we can provide file from command-line
which contains test list.
If no file is provided, standard python tests would be run (see `STDTESTS` from
`regrtest.py`). This should be assumed as *veryquick* testing.
Renamed test script.
Merge pull request #3 from rampage644/master

Testing suite
Added return code for testing script.
Merge pull request #4 from rampage644/dev

Testing script
added "release" build option to main build script

now running ./2build_zpython.sh release
will build python.tar in release mode:
- no debug build options
- main binary will be stripped
Merge pull request #5 from pkit/build_fixes

added "release" build option to main build script