Set permissions (#4845)

In some cases exec agent can fail to start due to the missing permission of current folder. We do the same like we do for ws-agent- we update permissions of /project folder

agents/exec/src/main/resources/org.eclipse.che.exec.script.sh

@@ -45,6 +45,8 @@ MACHINE_TYPE=$(uname -m)
 SHELL_INTERPRETER="/bin/sh"
 
 mkdir -p ${CHE_DIR}
+${SUDO} mkdir -p /projects
+${SUDO} sh -c "chown $(id -u -n) /projects"
 
 ########################
 ### Install packages ###