agent: Rename allowlist to ima_allowlist in keylime.conf
agent: Rename allowlist to ima_allowlist in keylime.conf

The keylime.conf file should have an ima_allowlist variable in the
tenant section, but it's currently called 'allowlist' therefore leading
to errors when trying to access it.

keylime/ima.py:348:        al_path = config.get('tenant', 'ima_allowlist')

This patch fixes this type of an error when using the tenant tool:

2021-05-11 19:46:27.895 - keylime.tpm - INFO - TPM2-TOOLS Version: 5.0
2021-05-11 19:46:27.902 - keylime.tenant - INFO - Setting up client TLS in /var/lib/keylime/cv_ca
2021-05-11 19:46:27.903 - keylime.tenant - INFO - TPM PCR Mask from policy is 0x408000
2021-05-11 19:46:27.903 - keylime.tenant - INFO - TPM PCR Mask from policy is 0x808000
Traceback (most recent call last):
  File "/usr/lib64/python3.8/configparser.py", line 789, in get
    value = d[option]
  File "/usr/lib64/python3.8/collections/__init__.py", line 898, in __getitem__
    return self.__missing__(key)            # support subclasses that define __missing__
  File "/usr/lib64/python3.8/collections/__init__.py", line 890, in __missing__
    raise KeyError(key)
KeyError: 'ima_allowlist'

Signed-off-by: Stefan Berger <5c96973112e540fb909b13997fcd087e5bfbee96@linux.ibm.com>

mit-ll/python-keylime,mit-ll/python-keylime,mit-ll/python-keylime,mit-ll/python-keylime