Move post_init_error again under exception handling block

[antonpirker]

Issue #, if available: #172

Description of changes:

Move post_init_error again under exception handling block to preserve possibility of calling sys.exc_info() in monkey patched post_init_error function.

Target (OCI, Managed Runtime, both):

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[trivenay]

Hey this change will break the functionality because we call the post_init_errorr in both the cases i.e during FaultException and generic Exception. If we move the call under Exception if the exception is caught in the FaultException block it won't call post_init_error

However we could refactor the piece of code to just have the Exception block and in that check it's type, if it's a FaultException exception then the way we generate error_result will change

In this way we can keep the error reporting functionality and your monkey patching would work. Although I would recommend to to take dependency on such specific behaviour as it is bound to change over a period of time