Change: Log to stderr, new log file build option.

Now the log messages are logged to stderr by default. The log file
for the generated gsad_log.conf can now be set by a new build option
GSAD_LOG_FILE.

CMakeLists.txt

@@ -117,11 +117,16 @@ else (NOT GVM_STATE_DIR)
   set (GVM_STATE_DIR "${GVM_STATE_DIR}")
 endif (NOT GVM_STATE_DIR)
 
-if (NOT GVM_LOG_DIR)
-  set (GVM_LOG_DIR "${LOCALSTATEDIR}/log/gvm")
-else (NOT GVM_LOG_DIR)
-  set (GVM_LOG_DIR "${GVM_LOG_DIR}")
-endif (NOT GVM_LOG_DIR)
+if (NOT GSAD_LOG_FILE)
+  if (GVM_LOG_DIR)
+    set (GSAD_LOG_FILE    "${GVM_LOG_DIR}/gsad.log")
+  else (GVM_LOG_DIR)
+    set (GSAD_LOG_FILE    "-")
+  endif (GVM_LOG_DIR)
+else (NOT GSAD_LOG_FILE)
+  set (GSAD_LOG_FILE    "${GSAD_LOG_FILE}")
+endif (NOT GSAD_LOG_FILE)
+message ("-- Log file: ${GSAD_LOG_FILE}")
 
 if (NOT GVM_SERVER_CERTIFICATE)
   set (GVM_SERVER_CERTIFICATE "${GVM_STATE_DIR}/CA/servercert.pem")

src/gsad_log_conf.cmake_in

@@ -7,40 +7,40 @@
 prepend=%t %s %p
 separator=:
 prepend_time_format=%Y-%m-%d %Hh%M.%S %Z
-file=${GVM_LOG_DIR}/gsad.log
+file=${GSAD_LOG_FILE}
 level=127
 
 [gsad  gmp]
 prepend=%t %s %p
 separator=:
 prepend_time_format=%Y-%m-%d %Hh%M.%S %Z
-file=${GVM_LOG_DIR}/gsad.log
+file=${GSAD_LOG_FILE}
 level=127
 
 [gsad i18n]
 prepend=%t %s %p
 separator=:
 prepend_time_format=%Y-%m-%d %Hh%M.%S %Z
-file=${GVM_LOG_DIR}/gsad.log
+file=${GSAD_LOG_FILE}
 level=127
 
 [gsad http]
 prepend=%t %s %p
 separator=:
 prepend_time_format=%Y-%m-%d %Hh%M.%S %Z
-file=${GVM_LOG_DIR}/gsad.log
+file=${GSAD_LOG_FILE}
 level=127
 
 [gsad vali]
 prepend=%t %s %p
 separator=:
 prepend_time_format=%Y-%m-%d %Hh%M.%S %Z
-file=${GVM_LOG_DIR}/gsad.log
+file=${GSAD_LOG_FILE}
 level=127
 
 [*]
 prepend=%t %s %p
 separator=:
 prepend_time_format=%Y-%m-%d %Hh%M.%S %Z
-file=${GVM_LOG_DIR}/gsad.log
+file=${GSAD_LOG_FILE}
 level=0