Refactor Rally exceptions

Registered by Roman Vasilets

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

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Roman Vasilets
Direction:
Needs approval
Assignee:
None
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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