Job's __unicode__ method leads to misleading representations

Expected Behavior

When printing job or converting one to string, I’d expect to see an indication that it is the Job object I’m operating on.

Current Behavior

Job prints its name followed by parenthesis and some properties. If the name is misleading (eg. MagicMock), the job disguises itself as something else.

Steps to Reproduce

task = MagicMock()
job = scheduler.add_job(task, ...)
print(job)
>>> MagicMock (trigger:...)

Context (Environment)

It is confusing and potentially error-prone when debugging or serialising Jobs.

Detailed Description

I suggest that Job should always print Job at the beginning when converting to unicode.

[agronholm]

@Voyz please subscribe to #465 to keep updated on the progress.

[Voyz]

hey @agronholm just following up on these two questions I posted last time. Thanks