cleanup: Map test files according to structure in src

For example cmd_account() is located in src/command/cmd_funcs.c.
The unit test was located in tests/unittests/test_cmd_account.c.
Let's move it to a subdirectory like tests/unittests/command/test_cmd_account.c
to correpsond to the same structure.

tests/unittests/unittests.c

@@ -10,31 +10,31 @@
 #include "config.h"
 #include "xmpp/chat_session.h"
 #include "helpers.h"
-#include "test_autocomplete.h"
-#include "test_chat_session.h"
+#include "tools/test_autocomplete.h"
+#include "xmpp/test_chat_session.h"
 #include "test_common.h"
-#include "test_contact.h"
-#include "test_cmd_connect.h"
-#include "test_cmd_account.h"
-#include "test_cmd_rooms.h"
-#include "test_cmd_sub.h"
-#include "test_cmd_presence.h"
-#include "test_cmd_otr.h"
-#include "test_cmd_pgp.h"
-#include "test_jid.h"
-#include "test_parser.h"
-#include "test_roster_list.h"
-#include "test_preferences.h"
-#include "test_server_events.h"
-#include "test_cmd_alias.h"
-#include "test_cmd_bookmark.h"
-#include "test_cmd_join.h"
-#include "test_muc.h"
-#include "test_cmd_roster.h"
-#include "test_cmd_disconnect.h"
-#include "test_form.h"
-#include "test_callbacks.h"
-#include "test_plugins_disco.h"
+#include "xmpp/test_contact.h"
+#include "command/test_cmd_connect.h"
+#include "command/test_cmd_account.h"
+#include "command/test_cmd_rooms.h"
+#include "command/test_cmd_sub.h"
+#include "command/test_cmd_presence.h"
+#include "command/test_cmd_otr.h"
+#include "command/test_cmd_pgp.h"
+#include "xmpp/test_jid.h"
+#include "tools/test_parser.h"
+#include "xmpp/test_roster_list.h"
+#include "config/test_preferences.h"
+#include "event/test_server_events.h"
+#include "command/test_cmd_alias.h"
+#include "command/test_cmd_bookmark.h"
+#include "command/test_cmd_join.h"
+#include "xmpp/test_muc.h"
+#include "command/test_cmd_roster.h"
+#include "command/test_cmd_disconnect.h"
+#include "xmpp/test_form.h"
+#include "plugins/test_callbacks.h"
+#include "plugins/test_plugins_disco.h"
 
 #define muc_unit_test(f) cmocka_unit_test_setup_teardown(f, muc_before_test, muc_after_test)