GT-2658 GhidraServer authentication via JAAS

Add JAAS auth mode -a4.
Supply some example JAAS config files.

Ghidra/RuntimeScripts/Common/server/server.conf

@@ -106,7 +106,7 @@ ghidra.repositories.dir=./repositories
 # Ghidra server startup parameters.  
 #
 # Command line parameters: (Add command line parameters as needed and renumber each starting from .1)
-#   [-ip <hostname>] [-i ###.###.###.###] [-p#] [-a#] [-anonymous] [-ssh] [-d<ntDomain>] [-e<days>] [-u] [-n] <repositories_path>
+#   [-ip <hostname>] [-i ###.###.###.###] [-p#] [-a#] [-anonymous] [-ssh] [-d<ntDomain>] [-e<days>] [-u] [-jaas <config_file>] [-autoProvision] [-n] <repositories_path>
 #
 #   -ip <hostname> : remote access hostname or IPv4 address to be used by clients
 #   -i #.#.#.# : interface IPv4 address to accept connections on (default all interfaces)
@@ -114,10 +114,15 @@ ghidra.repositories.dir=./repositories
 #   -a# : an optional authentication mode where # is a value 0 or 2
 #         0 - Private user password
 #         2 - PKI Authentication
+#         4 - JAAS Authentication
 #   -anonymous : enables anonymous repository access (see svrREADME.html for details)
 #   -ssh : enables SSH authentication for headless clients
 #   -e<days> : specifies default password expiration time in days (-a0 mode only, default is 1-day)
 #   -u   : enable users to be prompted for user ID (does not apply to -a2 PKI mode)
+#   -jaas <path_to_config_file> : specifies JAAS config file.
+#   -autoProvision : enable the auto-creation of Ghidra users when the authenticator module
+#                    (ie. OS or other authentication method specified by JAAS) authenticates
+#                    a new unknown user.
 #   -n   : enable reverse name lookup for IP addresses when logging (requires proper configuration 
 #          of reverse lookup by your DNS server)
 #   ${ghidra.repositories.dir} : config variable (defined above) which identifies the directory