Hide "Trying to get this manpage" messages for asadmin --help

[OndroMih]

Asadmin sets log level to FINE by default, unless --terse option is used. The "Trying to get this manpage" messages are useless for users, and there are many of them logged for by each asadmin command with --help option. Running asadmin with AS_DEBUG=true environment variable enables these messages if needed.

Current behavior:

The output of command asadmin --help prints the following at the beginning:

Trying to get this manpage: com/sun/enterprise/admin/cli/en/asadmin.9
Trying to get this manpage: com/sun/enterprise/admin/cli/en/asadmin.9m
Trying to get this manpage: com/sun/enterprise/admin/cli/en/asadmin.5asc
Trying to get this manpage: com/sun/enterprise/admin/cli/asadmin.1
Trying to get this manpage: com/sun/enterprise/admin/cli/asadmin.1m
asadmin(1M)                    Utility Commands                    asadmin(1M)

NAME
       asadmin - utility for performing administrative tasks for Oracle
       GlassFish Server

Only with the --terse option (asadmin --help --terse), the output doesn't contain the "Trying to get this manpage..." lines.

With the fix in this PR, the output of asadmin --help doesn't contain the "Trying to get this manpage..." lines. Same as the current behavior of asadmin --help --terse:

asadmin(1M)                    Utility Commands                    asadmin(1M)

NAME
       asadmin - utility for performing administrative tasks for Oracle
       GlassFish Server

If needed, the "Trying to get this manpage..." lines can be displayed by setting the AS_DEBUG or AS_TRACE env variables to true, for example:

AS_DEBUG=true asadmin --help