Merge changes Iaf2ec527,I6d6abd44,I6304e0de,Ia4fbce58,I3b60dfa4, ... into sc-dev

* changes:
  first_stage_mount: mount point must be canonical path
  fs_mgr_fstab: Parse overlayfs options from fs flags
  Remove deprecated fs_mgr_overlayfs_required_devices()
  adb-remount-test: Make awk scripts mawk-v1.3.3-compatible
  Make fs_mgr_overlayfs_mount_fstab_entry() available for user builds
  adb-remount-test: Strengthen skip_administrative_mounts
  fs_mgr_overlayfs_mount_fstab_entry(): Rename source device name
  fs_mgr_overlayfs: Polish fs_mgr_overlayfs_mount_fstab_entry()
  first_stage_mount: Remove "overlay" hack from InitRequiredDevices()
  fs_mgr_vendor_overlay: Mount vendor overlay with noatime