Fix contrail-api-client python package classifier

Contraily-api-client python package uses a non existing classifier
'Environment :: OpenContrail', remove it.

Change-Id: I001db32ee506f478877e5b327dc9c9525c727234
Closes-Bug: #1776738

api-lib/setup.py

@@ -34,7 +34,6 @@ def requirements(filename):
     url='http://www.opencontrail.org/documentation/api/r4.1/',
     version=open('version.info', 'r+').read().strip('\n').strip('\t'),
     classifiers=[
-        'Environment :: OpenContrail',
         'Intended Audience :: Information Technology',
         'Intended Audience :: Developers',
         'Intended Audience :: System Administrators',