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Test provider for pegasus as explained in PEP#121

Multiple threads creation Test
------------------------------

The source files present in this directory implements a test case for checking
provider behaviour when new sub-processes are created from inside the provider
methods.
Source programs included:
MultithreadingSampleProviderMain.cpp
MultithreadingSampleProvider.cpp
MultithreadingSampleProvider.h
MultithreadingSampleProvider.mof - MultithreadSampleClass MOF
MultithreadingSampleProviderR.mof - Provider Registration MOF

build
-----
This script builds the MultithreadingSample provider sources, registers the
classes into the CIM repository and registers the provider(by compiling the 2 
mof files using cimmofl).
It also stops and restarts the cimserver in order to re-read the repository to
make sure that new classes are registered.

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The implementation is done in the following manner:

1. MultithreadingSampleProviderMain.cpp is the source file which contains the
provider entry point routine.

2. MultithreadingSampleProvider.cpp [h] are the main provider sources that
implement the MultithreadingSampleClass.

3. The Base class has 3 derived classes called ThreadSampleOne, ThreadSampleTwo
and ThreadSampleThree.

4. ThreadSampleOne class instances are created inside the enumerateInstances 
method of the provider. After the instances creation this method calls 
explicitly the CreateThread function, which spawns a new sub-process and 
executes the command line cim client CLI.

5. The additional functions added in the provider source program other than the 
standard methods are:
CreateThread() - Function creating the sub-process (by using fork())
reader() - child process reads from the input stream
writer() - Parent process writing to the output stream

This test program is currently tested only on Linux and AIX (on x86 arch.).
It might not be working on non-unix platforms because of the usage of platform
specific system calls like fork(), and sleep();

The parent process after writing to the output stream sleeps in the function
writer() which makes the CLI command give a timeout error.

TEST the Provider Working
-------------------------

1. Run the following command for checking the working of this provider:

CLI niall -n root/SampleProvider ThreadSampleOne

2. Run "TestClient" program present in the pegasus sources (to check for the
new classes registered by any new providers) as follows:
	TestClient --n root/SampleProvider
[You need to make sure that the TestClient is run for the SampleProvider 
repository because by default it runs only for root/cimv2]