[Cisco ASA] Fix the handling of spaces in 113005 messages

[chemamartinez]

What does this PR do?

It fixes the parsing of a 113005 Cisco ASA message as follows:

Jul  1 09:27:13 216.160.83.56 : %ASA-6-113005: AAA user authentication Rejected : reason = AAA failure : server = 81.2.69.142 : user = 123 : user IP = 89.160.20.112

The grok processor failed because of an unexpected space after AAA user authentication Rejected. This can potentially happen with every field so now the pattern expects that every value can be followed by spaces.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

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Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

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• Start Time: 2023-08-02T10:08:30.710+0000

• Duration: 17 min 42 sec

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Test	Results
Failed	0
Passed	23
Skipped	0
Total	23

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚
Classes	100.0% (1/1)	💚
Methods	94.444% (17/18)	👍 7.583
Lines	69.824% (1548/2217)	👎 -21.92
Conditionals	100.0% (0/0)	💚

[ShourieG]

Lgtm

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Package cisco_asa - 2.20.1 containing this change is available at https://epr.elastic.co/search?package=cisco_asa