title: bbappend file for replacing a file
body: <p>I created a new layer in yocto: meta-abc, a recipe: abc-efg_0.1.bb and an .bbapend: abc-efg_01.bbapend file.
  With the bbappend file I want to overwrite a file from intel-edison board.
  More exactly, the wpa_supplicant.conf from /etc/wpa_supplicant/.
  This wpa_supplicant.conf is already created from another layer (meta-intel-edison-distro).
  I can write my file in /etc/ so my recipe and my bbappend file are working.
  I can bitbake my recipe, but when I try to creat the image I receive the message:</p>
  
  <p>" * check_data_file_clashes: Package abc-efg wants to install file /home/atr-int/Desktop/Yocto/yocto-edison/build_edison/tmp/work/edison-poky-linux/edison-image/1.0-r0/rootfs/etc/wpa_supplicant/wpa_supplicant.conf
      But that file is already provided by package  * wpa-supplicant
   * opkg_install_cmd: Cannot install package abc-etc.
  "
  Here is my bbappend file content:</p>
  
  <pre><code>FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
  
  SRC_URI += "file://wpa_supplicant.conf"
  
  do_install_append() {
  install -d ${D}${sysconfdir}/wpa_supplicant
  install -m 0755 ${WORKDIR}/wpa_supplicant.conf 
      ${D}${sysconfdir}/wpa_supplicant
  }
  </code></pre>
  
  <p>Can anyone give my any tip ?
  Thank you.</p>