Changed defaults for installation locations

* SYSCONFDIR is /etc by default now
* LOCALSTATEDIR is /var by default now
* OPENVAS_RUN_DIR is /run/ospd by default now
* OPENVAS_FEED_LOOK_PATH is /var/lib/openvas/feed-update.lock by default
  now

/run/ospd is used because normally openvas is started from ospd-openvas
which by default uses the /run/ospd path in the systemd service file.
This ensures that the directory for the OPENVAS_RUN_DIR exists at
runtime.

/var/lib/openvas/feed-update.lock is used because the sync scripts may
be started when the services are stopped an /run/ospd (or an other
directory in /run) is not available anymore.

CMakeLists.txt

@@ -132,7 +132,7 @@ if (SYSCONF_INSTALL_DIR)
 endif (SYSCONF_INSTALL_DIR)
 
 if (NOT SYSCONFDIR)
-  set (SYSCONFDIR "${CMAKE_INSTALL_PREFIX}/etc")
+  set (SYSCONFDIR "/etc")
 endif (NOT SYSCONFDIR)
 
 if (NOT EXEC_PREFIX)
@@ -161,24 +161,25 @@ if (NOT LIBDIR)
 endif (NOT LIBDIR)
 
 if (NOT LOCALSTATEDIR)
-  set (LOCALSTATEDIR "${CMAKE_INSTALL_PREFIX}/var")
+  set (LOCALSTATEDIR "/var")
 endif (NOT LOCALSTATEDIR)
 
 if (NOT DATADIR)
   set (DATADIR "${CMAKE_INSTALL_PREFIX}/share")
 endif (NOT DATADIR)
 
 if (NOT OPENVAS_RUN_DIR)
-  set (OPENVAS_RUN_DIR "${LOCALSTATEDIR}/run")
+  set (OPENVAS_RUN_DIR "/run/ospd")
 endif (NOT OPENVAS_RUN_DIR)
 
+set (OPENVAS_DATA_DIR    "${DATADIR}/openvas")
+set (OPENVAS_STATE_DIR   "${LOCALSTATEDIR}/lib/openvas")
+
 if (NOT OPENVAS_FEED_LOCK_PATH)
-  set (OPENVAS_FEED_LOCK_PATH "${OPENVAS_RUN_DIR}/feed-update.lock")
+  set (OPENVAS_FEED_LOCK_PATH "${OPENVAS_STATE_DIR}/feed-update.lock")
 endif (NOT OPENVAS_FEED_LOCK_PATH)
 add_definitions (-DOPENVAS_FEED_LOCK_PATH="${OPENVAS_FEED_LOCK_PATH}")
 
-set (OPENVAS_DATA_DIR    "${DATADIR}/openvas")
-set (OPENVAS_STATE_DIR   "${LOCALSTATEDIR}/lib/openvas")
 if (NOT GVM_LOG_DIR)
 	set (GVM_LOG_DIR         "${LOCALSTATEDIR}/log/gvm")
 endif (NOT GVM_LOG_DIR)