[common_test] Added tests and corrected bugs in ct_snmp

OTP-10454
OTP-10434

Function register_users/2, register_agents/2 and register_usm_users/2,
and the corresponding unregister_*/1 functions were not
executable. These are corrected/rewritten.

Function update_usm_users/2 is removed, and an unregister function is
added instead. Update can now be done with unregister_usm_users and
then register_usm_users.

Functions unregister_*/2 are added, so specific users/agents/usm users
can be unregistered.

Function unload_mibs/1 is added.

Overriding configuration files did not work, since the files were
written in priv_dir instead of in the configuration dir
(priv_dir/conf). This has been corrected.

Minor updates to documentation.

1 files changed, 43 insertions, 19 deletions

diff --git a/lib/common_test/test/ct_snmp_SUITE_data/snmp.cfg b/lib/common_test/test/ct_snmp_SUITE_data/snmp.cfg
index b0ac0e6a96..895e097de6 100644
--- a/lib/common_test/test/ct_snmp_SUITE_data/snmp.cfg
+++ b/lib/common_test/test/ct_snmp_SUITE_data/snmp.cfg
@@ -1,20 +1,44 @@
 %% -*- erlang -*-
-{snmp, [{start_agent,true},
-	{users,[{user_name,[snmp1_SUITE,[]]}]},
-	{managed_agents,[{agent_name, [user_name, {127,0,0,1}, 4000,
-				       [{engine_id,"ct_snmp-test-engine"},
-					{version,v2}]]}]},
-	{engine_id,"ct_snmp-test-engine"},
-	{agent_vsns,[v2]}
-       ]}.
-{snmp_app,[{manager, [{config, [{verbosity, silence}]},
-		      {server,[{verbosity,silence}]},
-		      {net_if,[{verbosity,silence}]},
-		      {versions,[v2]}
-		     ]},
-	   {agent, [{config, [{verbosity, silence}]},
-		    {net_if,[{verbosity,silence}]},
-		    {mib_server,[{verbosity,silence}]},
-		    {local_db,[{verbosity,silence}]},
-		    {agent_verbosity,silence}
-		   ]}]}.
+{snmp1, [{start_agent,true},
+	 {users,[{user_name,[snmpm_user_default,[]]}]},
+	 {managed_agents,[{agent_name, [user_name, {127,0,0,1}, 4000,
+					[{engine_id,"ct_snmp-test-engine"},
+					 {version,v2}]]}]},
+	 {engine_id,"ct_snmp-test-engine"},
+	 {agent_vsns,[v2]}
+	]}.
+{snmp2, [{start_agent,true},
+	 {engine_id,"ct_snmp-test-engine"}
+	]}.
+{snmp3, [{start_agent,true},
+	 {engine_id,"ct_snmp-test-engine"},
+	 {agent_vsns,[v1,v2,v3]},
+	 {agent_contexts,{data_dir_file,"context.conf"}},
+	 {agent_usm,{data_dir_file,"usm.conf"}},
+	 {agent_community,{data_dir_file,"community.conf"}},
+	 {agent_notify_def,{data_dir_file,"notify.conf"}},
+	 {agent_sysinfo,{data_dir_file,"standard.conf"}},
+	 {agent_target_address_def,{data_dir_file,"target_addr.conf"}},
+	 {agent_target_param_def,{data_dir_file,"target_params.conf"}},
+	 {agent_vacm,{data_dir_file,"vacm.conf"}}]}.
+{snmp_app1,[{manager, [{config, [{verbosity, silence}]},
+		       {server,[{verbosity,silence}]},
+		       {net_if,[{verbosity,silence}]},
+		       {versions,[v2]}
+		      ]},
+	    {agent, [{config, [{verbosity, silence}]},
+		     {net_if,[{verbosity,silence}]},
+		     {mib_server,[{verbosity,silence}]},
+		     {local_db,[{verbosity,silence}]},
+		     {agent_verbosity,silence}
+		    ]}]}.
+{snmp_app2,[{manager, [{config, [{verbosity, silence}]},
+		       {server,[{verbosity,silence}]},
+		       {net_if,[{verbosity,silence}]}
+		      ]},
+	    {agent, [{config, [{verbosity, silence}]},
+		     {net_if,[{verbosity,silence}]},
+		     {mib_server,[{verbosity,silence}]},
+		     {local_db,[{verbosity,silence}]},
+		     {agent_verbosity,silence}
+		    ]}]}.