Define cache_entry and public_key outside the if statement

[dmasteller4]

When defining a private key file, cache_entry is undefined, as well as public_key. This moves the two objects outside the if statement above, so they are always defined.

More verbose error output:

Unexpected failure during module execution.
The full traceback is:
Traceback (most recent call last):
  File "/home/ec2-user/.local/lib/python3.8/site-packages/ansible/executor/task_executor.py", line 158, in run
    res = self._execute()
  File "/home/ec2-user/.local/lib/python3.8/site-packages/ansible/executor/task_executor.py", line 605, in _execute
    result = self._handler.run(task_vars=variables)
  File "/home/ec2-user/.local/lib/python3.8/site-packages/ansible/plugins/action/gather_facts.py", line 100, in run
    res = self._execute_module(module_name=fact_module, module_args=mod_args, task_vars=task_vars, wrap_async=False)
  File "/home/ec2-user/.local/lib/python3.8/site-packages/ansible/plugins/action/__init__.py", line 973, in _execute_module
    self._make_tmp_path()
  File "/home/ec2-user/.local/lib/python3.8/site-packages/ansible/plugins/action/__init__.py", line 390, in _make_tmp_path
    tmpdir = self._remote_expand_user(self.get_shell_option('remote_tmp', default='~/.ansible/tmp'), sudoable=False)
  File "/home/ec2-user/.local/lib/python3.8/site-packages/ansible/plugins/action/__init__.py", line 856, in _remote_expand_user
    data = self._low_level_execute_command(cmd, sudoable=False)
  File "/home/ec2-user/.local/lib/python3.8/site-packages/ansible/plugins/action/__init__.py", line 1253, in _low_level_execute_command
    rc, stdout, stderr = self._connection.exec_command(cmd, in_data=in_data, sudoable=sudoable)
  File "/usr/share/ansible/plugins/connection/eci.py", line 465, in exec_command
    self.set_option('private_key_file', self._get_eci_data()[ECI_CACHE_KEY_FILE])
  File "/usr/share/ansible/plugins/connection/eci.py", line 548, in _get_eci_data
    if(ECI_CACHE_INSTANCE_ID in cache_entry):
UnboundLocalError: local variable 'cache_entry' referenced before assignment
fatal: [server01]: FAILED! => {}