Simplify the log constants and add another one

The patch changes the log constants by moving the slash to the end of
the log dir instead of at the beginning of *each* log file name.

It also adds a new LOG_COMMANDS constant (to be used in a next patch).

Reviewed-by: ultrotter

lib/constants.py

@@ -108,13 +108,14 @@ FIRST_DRBD_PORT = 11000
 LAST_DRBD_PORT = 14999
 MASTER_SCRIPT = "ganeti-master"
 
-LOG_DIR = _autoconf.LOCALSTATEDIR + "/log/ganeti"
-LOG_OS_DIR = LOG_DIR + "/os"
-LOG_NODESERVER = LOG_DIR + "/node-daemon.log"
-LOG_WATCHER = LOG_DIR + "/watcher.log"
-LOG_MASTERDAEMON = LOG_DIR + "/master-daemon.log"
-LOG_RAPISERVER = LOG_DIR + "/rapi-daemon.log"
-LOG_RAPIACCESS = LOG_DIR + "/rapi-access.log"
+LOG_DIR = _autoconf.LOCALSTATEDIR + "/log/ganeti/"
+LOG_OS_DIR = LOG_DIR + "os"
+LOG_NODESERVER = LOG_DIR + "node-daemon.log"
+LOG_WATCHER = LOG_DIR + "watcher.log"
+LOG_MASTERDAEMON = LOG_DIR + "master-daemon.log"
+LOG_RAPISERVER = LOG_DIR + "rapi-daemon.log"
+LOG_RAPIACCESS = LOG_DIR + "rapi-access.log"
+LOG_COMMANDS = LOG_DIR + "commands.log"
 
 OS_SEARCH_PATH = _autoconf.OS_SEARCH_PATH
 EXPORT_DIR = _autoconf.EXPORT_DIR