Fix for isis learn and removed duplicate parser

[Taarini]

Description

Traceback (most recent call last):
  File "/usr/lib/python3.8/code.py", line 90, in runcode
    exec(code, self.locals)
  File "<console>", line 1, in <module>
  File "src/genie/conf/base/device.py", line 632, in genie.conf.base.device.Device.learn
  File "/home/jenkins/.local/lib/python3.8/site-packages/genie/libs/ops/isis/iosxe/isis.py", line 447, in learn
    self.make()
  File "/home/jenkins/.local/lib/python3.8/site-packages/genie/ops/base/base.py", line 103, in make
    self.maker.make(*args, **kwargs)
  File "src/genie/ops/base/maker.py", line 315, in genie.ops.base.maker.Maker.make
  File "src/genie/ops/base/maker.py", line 427, in genie.ops.base.maker.Maker._call_parser
  File "src/genie/metaparser/_metaparser.py", line 308, in genie.metaparser._metaparser.MetaParser.parse
  File "/home/jenkins/.local/lib/python3.8/site-packages/genie/libs/parser/iosxe/show_clns.py", line 669, in cli
    type_dict.update({'area_address': group['area_address'].split()})
UnboundLocalError: local variable 'type_dict' referenced before assignment

Motivation and Context

To fix the above issue and also remove the duplicate parser

Impact (If any)

Not backward compatible

Screenshots:

Checklist:

• I have updated the changelog.
• I have updated the documentation (If applicable).
• I have added tests to cover my changes (If applicable).
• All new and existing tests passed.
• All new code passed compilation.

[GerriorL]

Needs changelog and make JSON