libnetconf UPDATE YANG data configuration

Configuration based on YANG data. Open 2 ssh channels on one
session. Pubkey,interactive,pw,none SSH authentication working. SSH
message callback not a callback anymore, handle SSH messages manually.
ietf-netconf-server and all models it imports added and a libnetconf2 own model
with augments. And finally only local-definition of keys supported. 2 tests.
NBC API changes.
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 663c0c4..8796d89 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -8,11 +8,11 @@
 endif()
 
 # list of all the tests in each directory
-set(tests test_io test_fd_comm test_init_destroy_client test_init_destroy_server test_client_thread test_thread_messages)
+set(tests test_nc3)
 
 # only enable PAM tests if the version of PAM is greater than 1.4
 if(LIBPAM_HAVE_CONFDIR)
-    list(APPEND tests test_pam)
+    list(APPEND tests test_auth test_two_channels)
 endif()
 
 set(client_tests test_client test_client_messages)
@@ -37,7 +37,7 @@
 
 #append tests depending on SSH/TLS
 if(ENABLE_SSH OR ENABLE_TLS)
-    list(APPEND tests test_server_thread)
+    #list(APPEND tests test_server_thread)
     if(ENABLE_SSH)
         list(APPEND client_tests test_client_ssh)
     endif()