TypeError enumerating images a PreStdLogicalImageContainer

[gonmator]

A TypeError is raised when listing the content of a volume instance of a PreStdLogicalImageContainer. (For instance, calling the printLogicalImageInfo() function in aff4.py. The error I got:

TypeError: __init__() missing 1 required positional argument: 'pathName'

I found the issue is in container.LogicalImageContainer and container.PreStdLogicalImageContainer classes. While the method images() of the first class initialize correctly the LogicalImage instance to be yield:

yield aff4.LogicalImage(self, self.resolver, self.urn, image, pathName)

the method images() of PreStdLogicalImageContainer class and method open() of both classes missed to pass the container (self) as first parameter:

yield aff4.LogicalImage(self.resolver, self.urn, image, pathName)
...
return aff4.LogicalImage(self.resolver, self.urn, urn, pathName)

Initializer of aff4.LogicalImage expects the container as first parameter:

class LogicalImage(AFF4Object):
    def __init__(self, container, resolver, volume, urn, pathName):
        super(LogicalImage, self).__init__(resolver, urn)
        self.volume = volume
        self.pathName = pathName
        self.container = container

Just passing self as first parameter should solve the issue.

(I could prepare a pull request if needed, but I would like to have some guide about branch naming, etc.)