Refactor Rally exceptions

Registered by Roman Vasilets on 2015-02-24

There are a lot of exceptions that are inherited from NotFoundException but his functionality doesn't used. See link https://github.com/stackforge/rally/blob/master/rally/exceptions.py#L122 . For uniformity It is needed to inherit it from Rally exception.

Before:
class NoSuchPlugin(NotFoundException):
    msg_fmt = _("There is no plugin with name: `%(name)s`.")

After:
class NoSuchPlugin(RallyException):
    msg_fmt = _("There is no plugin with name: `%(name)s`.")

Blueprint information

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Drafter:
Roman Vasilets
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Needs approval
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New
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