Provide validation for jailname in middleware

iocage create -n foo+bar -r 11.2-RELEASE
Invalid character in foo+bar, please remove it.

Error: concurrent.futures.process._RemoteTraceback: 
"""
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/iocage_lib/ioc_create.py", line 267, in _create_jail
    f"root@{jail_uuid}"], stderr=su.PIPE)
  File "/usr/local/lib/python3.6/subprocess.py", line 291, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['zfs', 'snapshot', 'tank/iocage/releases/11.2-RELEASE/root@foo+bar']' returned non-zero exit status 1.During handling of the above exception, another exception occurred:Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/iocage_lib/ioc_create.py", line 270, in _create_jail
    snapshot = self.zfs.get_snapshot(dataset)
  File "libzfs.pyx", line 609, in libzfs.ZFS.get_snapshot
libzfs.ZFSException: Snapshot tank/iocage/releases/11.2-RELEASE/root@foo+bar not foundDuring handling of the above exception, another exception occurred:Traceback (most recent call last):
  File "/usr/local/lib/python3.6/concurrent/futures/process.py", line 175, in _process_worker
    r = call_item.fn(*call_item.args, **call_item.kwargs)
  File "/usr/local/lib/python3.6/site-packages/middlewared/worker.py", line 128, in main_worker
    res = loop.run_until_complete(coro)
  File "/usr/local/lib/python3.6/asyncio/base_events.py", line 468, in run_until_complete
    return future.result()
  File "/usr/local/lib/python3.6/site-packages/middlewared/worker.py", line 88, in _run
    return await self._call(f'{service_name}.{method}', serviceobj, methodobj, params=args, job=job)
  File "/usr/local/lib/python3.6/site-packages/middlewared/worker.py", line 81, in _call
    return methodobj(*params)
  File "/usr/local/lib/python3.6/site-packages/middlewared/worker.py", line 81, in _call
    return methodobj(*params)
  File "/usr/local/lib/python3.6/site-packages/middlewared/plugins/jail.py", line 200, in create_job
    empty=empty
  File "/usr/local/lib/python3.6/site-packages/iocage_lib/iocage.py", line 611, in create
    clone=clone,
  File "/usr/local/lib/python3.6/site-packages/iocage_lib/ioc_create.py", line 87, in create_jail
    return self._create_jail(jail_uuid, location)
  File "/usr/local/lib/python3.6/site-packages/iocage_lib/ioc_create.py", line 283, in _create_jail
    f"RELEASE: {self.release} not found!")
RuntimeError: RELEASE: 11.2-RELEASE not found!
"""The above exception was the direct cause of the following exception:Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/middlewared/job.py", line 332, in run
    await self.future
  File "/usr/local/lib/python3.6/site-packages/middlewared/job.py", line 356, in __run_body
    rv = await self.middleware._call_worker(self.serviceobj, self.method_name, *self.args, job={'id': self.id})
  File "/usr/local/lib/python3.6/site-packages/middlewared/main.py", line 1105, in _call_worker
    job,
  File "/usr/local/lib/python3.6/site-packages/middlewared/main.py", line 1036, in run_in_proc
    return await self.run_in_executor(self.__procpool, method, *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/middlewared/main.py", line 1021, in run_in_executor
    return await loop.run_in_executor(pool, functools.partial(method, *args, **kwargs))
RuntimeError: RELEASE: 11.2-RELEASE not found!