Remove workaround for sagenb pull request 84

[roed314]

In #12415 we added

# Workarounds for https://github.com/sagemath/sagenb/pull/84
import sagenb.notebook.misc
import sagenb.notebook.sage_email
def fixed_default_email_address():
    import socket
    import getpass
    return getpass.getuser() + "@" + socket.gethostname()
sagenb.notebook.sage_email.default_email_address = fixed_default_email_address

to sage.doctest.forker. These whould be removed once the newer version of sagenb is incorporated into Sage.

Depends on #12415
Depends on #14330
Depends on #14266

CC: @kini @jdemeyer

Component: doctest framework

Author: R. Andrew Ohana

Branch: u/tkluck/ticket/14273

Reviewer: Jeroen Demeyer, Punarbasu Purkayastha

Merged: sage-5.12.beta0

Issue created by migration from https://trac.sagemath.org/ticket/14273

[jdemeyer]

Changed dependencies from #12415 to #12415, #14330

[ohanar]

Author: R. Andrew Ohana

[jdemeyer]

Reviewer: Jeroen Demeyer

[jdemeyer]

comment:4

Assuming that sagemath/sagenb#84 is merged, this patch is obviously fine.