[Bug 239385] syslog: make it posible to have "." in app_name

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239385

            Bug ID: 239385
           Summary: syslog: make it posible to have "." in app_name
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: bugs.freebsd.org at reg.a0fs.net

App_name field in current syslog message parsed with this code:
----- >8 -------
        app_name_length = strspn(m,
            "abcdefghijklmnopqrstuvwxyz"
            "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
            "0123456789"
            "_-/")
---- >8 --------
What if it will look like that:
----- >8 -------
        app_name_length = strspn(m,
            "abcdefghijklmnopqrstuvwxyz"
            "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
            "0123456789"
            "._-/")
---- >8 -------- 
to have something like `com.example.myprog[1234]` as valid identity?

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