gitlint: check for bad authors

Similar to how we expect Signed-off-by to be legal names matching
something from a CLA, it is helpful if the Author is formatted
similarly. Often, a new user especial

gitlint: check for bad authors

Similar to how we expect Signed-off-by to be legal names matching
something from a CLA, it is helpful if the Author is formatted
similarly. Often, a new user especially, we fix their git-config and
the Signed-off-by but leave the author as a username-like. This leads
to the SRCREV bump script creating a commit message referencing a
[likely non-public] username instead of the proper name of the author.

Tested:
```
Running commit_gitlint (0.19.1)
-: UC4 Author user has too few words; likely user id instead of legal name?: "joe-bob"
```

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I6a3da5b27cd57de5758ba9277ae5d8b2e0570a5e

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gitlint: screen userid from Signed-off-by

It is a common issue for new users to have a git-config that has a
user id (either from their system or github) rather than a legal name
matching an entry i

gitlint: screen userid from Signed-off-by

It is a common issue for new users to have a git-config that has a
user id (either from their system or github) rather than a legal name
matching an entry in their associated CLA. Screen these out in the
gitlint check, so maintainers do not need to check this manually.

Some individuals decide to go by a one word name. Provide an exception
for this.

Tested:

```
-: UC3 Signed-off-by user has too few words; likely user id instead of legal name?: "Signed-off-by: foo <foo@nobody.com>"
-: UC3 Invalid Signed-off-by format: "Signed-off-by: bar"
```

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ie87d640db8f0d223912f7c3b77545347020255ee

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