Merge pull request #2 from DIRACGrid/rel-v6r11

Rel v6r11
__init__() got an unexpected keyword argument 'requireVoms'

class ProxyDB( DB ):
def __init__( self,
useMyProxy = False,
maxQueueSize = 10 ):
Merge pull request #1920 from yuw726/rel-v6r11-fix

[v6r11] MyProxyRenewalAgent: unexpected argument 'requireVoms'