Redirection of solver output is no longer needed

[ksbeattie]

This functionality is no longer needed within idaes-pse, as Pyomo can now do this.

[mrmundt]

Longer details:

In the new solver interfaces, we finally introduced a handy-dandy capability to not just turn tee on or off in the config:

        self.tee: List[TextIO] = self.declare(
            'tee',
            ConfigValue(
                domain=TextIO_or_Logger,
                default=False,
                description="""``tee`` accepts :py:class:`bool`,
                :py:class:`io.TextIOBase`, or :py:class:`logging.Logger`
                (or a list of these types).  ``True`` is mapped to
                ``sys.stdout``.  The solver log will be printed to each of
                these streams / destinations.""",
            ),
        )

It can now be passed a bool, an io.TextIOBase-type-object, or a logger. For example:

import pyomo.environ as pyo
import io, logging

log_stream = io.StringIO()
logging.basicConfig(stream=log_stream, level=logging.INFO)
logger = logging.getLogger('contrib.solver.config.test.1')

m = pyo.ConcreteModel()
m.x = pyo.Var([1, 2], initialize=1, bounds=(0, None))
m.eq = pyo.Constraint(expr=m.x[1] * m.x[2] ** 1.5 == 3)
m.obj = pyo.Objective(expr=m.x[1] ** 2 + m.x[2] ** 2)

solver = pyo.SolverFactory("ipopt_v2")
solver.solve(m, tee=logger, timelimit=5)

log_contents = log_stream.getvalue()
print(log_contents)

The output from solver.solve gets added to the logger (INFO level).