fix(cloudwatch): ignore new lines in filters

[MrCloudSec]

Description

Add flag re.DOTALL to ignore new line characters in CloudWatch metric filters.

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[jfagoagas]

That's great!

Could you please include a test for each check setting the filterPattern with \n? Like:

{\n  ($.eventSource = config.amazonaws.com) &&\n  (($.eventName=StopConfigurationRecorder)||\n   ($.eventName=DeleteDeliveryChannel)||\n   ($.eventName=PutDeliveryChannel)||\n   ($.eventName=PutConfigurationRecorder))\n}

[jfagoagas]

See above comment.

[codecov]

Codecov Report

Merging #2912 (49010de) into master (dec0ee1) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2912   +/-   ##
=======================================
  Coverage   86.18%   86.18%           
=======================================
  Files         539      539           
  Lines       17374    17374           
=======================================
  Hits        14974    14974           
  Misses       2400     2400           

Files	Coverage Δ
...dwatch_changes_to_network_acls_alarm_configured.py	100.00% <100.00%> (ø)
...ch_changes_to_network_gateways_alarm_configured.py	100.00% <100.00%> (ø)
...hanges_to_network_route_tables_alarm_configured.py	100.00% <100.00%> (ø)
...red/cloudwatch_changes_to_vpcs_alarm_configured.py	100.00% <100.00%> (ø)
...rm_for_aws_config_configuration_changes_enabled.py	100.00% <100.00%> (ø)
...rm_for_cloudtrail_configuration_changes_enabled.py	100.00% <100.00%> (ø)
...watch_log_metric_filter_authentication_failures.py	100.00% <100.00%> (ø)
...tch_log_metric_filter_aws_organizations_changes.py	100.00% <100.00%> (ø)
...filter_disable_or_scheduled_deletion_of_kms_cmk.py	100.00% <100.00%> (ø)
..._log_metric_filter_for_s3_bucket_policy_changes.py	100.00% <100.00%> (ø)
... and 5 more

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