The 'ldap' provider misses 'ldap' extra dep (which adds ldap3 pip dependency).
setup.py
'gevent>=0.13',
    'greenlet>=0.4.9',
]
atlas = [
    'atlasclient>=0.1.2',
]
azure = [
    'azure-batch>=8.0.0',
    'azure-cosmos>=3.0.1,<4',
    'azure-datalake-store>=0.0.45',
    'azure-identity>=1.3.1',
    'azure-keyvault>=4.1.0',
    'azure-kusto-data>=0.0.43,<0.1',
    'azure-mgmt-containerinstance>=1.5.0,<2.0',
    'azure-mgmt-datalake-store>=0.5.0',
    'azure-mgmt-resource>=2.2.0',
    'azure-storage>=0.34.0, <0.37.0',
]
cassandra = [
    'cassandra-driver>=3.13.0,<3.21.0',
]
celery = [
    'celery~=4.4.2',
    'flower>=0.7.3, <1.0',
    'vine~=1.3',  
]
cgroups = [
    'cgroupspy>=0.1.4',
]
cloudant = [