icecc-create-env-native: Drop FILESPATH, document PATCHTOOL

:Release Notes:
Backport a29c71024c304263bfb0732c870f20c1a6af7f64 from oe-core.
Moving icecc-create-env to BPN allows to drop FILESPATH.
Document PATCHTOOL, because it's not easy to guess why it's needed.

:Detailed Notes:

:Testing Performed:
Only build tested.

:QA Notes:

:Issues Addressed:
[ANG-787] ICECC deployment in part of build infrastructure
[ANG-789] CCC: Enable usage of ICECC as part of build infrastructure

Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <martin.jansa@lge.com>

Change-Id: I4789bbd45a199f3c2660b258d1d2d95e419ca0ac
Reviewed-on: https://g2g.palm.com/4641
Reviewed-by: DCO Verification
Reviewed-by: Martin Jansa <Martin.Jansa@lge.com>
Tested-by: Martin Jansa <Martin.Jansa@lge.com>
Reviewed-by: Alexander Irhin <alexander.irhin@lge.com>
webos-image: exclude components from icecc build

:Release Notes:
In order to build the full WebOS image using ICECC, some components
continue to fail to build.  This patch disables the ICECC feature
from being used by these components

:Detailed Notes:

:Testing Performed:
Built full image from source. Ran MiniBAT on the resulting image.

:QA Notes:

:Issues Addressed:
[ANG-787] ICECC deployment in part of build infrastructure
[ANG-789] CCC: Enable usage of ICECC as part of build infrastructure

Open-webOS-DCO-1.0-Signed-off-by: Iyad Qumei <iyad.qumei@lge.com>

Change-Id: Ic8dc6cf5e51fb8c4b04cfa2f9ba9082544bebab8
Reviewed-on: https://g2g.palm.com/4121
Reviewed-by: DCO Verification
Reviewed-by: Martin Jansa <Martin.Jansa@lge.com>
Reviewed-by: Iyad Qumei <iyad.qumei@lge.com>
Tested-by: Iyad Qumei <iyad.qumei@lge.com>
Reviewed-by: Keith Derrick <keith.derrick@lge.com>
Reviewed-by: Alexander Irhin <alexander.irhin@lge.com>
webos-image: Modify ROOTFS_READ_ONLY global variable handling

:Release Notes:
Create baseline handling of ROOTFS_READ_ONLY global variable in the
Open WebOS layer.

:Detailed Notes:
In additon, check if change to ROOTFS_READ_ONLY value was correctly
changed.

:Testing Performed:
Ran MiniBAT

:QA Notes:

:Issues Addressed:
[ANG-788] Modify the ROOTFS_READ_ONLY global variable handling
[ANG-791] CCC: Modify the ROOTFS_READ_ONLY global variable handling

Open-webOS-DCO-1.0-Signed-off-by: Iyad Qumei <iyad.qumei@lge.com>

Change-Id: I6dc9bf7f55c9acca7ee7f89df8066b1dbdde0cb6
Reviewed-on: https://g2g.palm.com/4221
Reviewed-by: Iyad Qumei <iyad.qumei@lge.com>
Tested-by: Iyad Qumei <iyad.qumei@lge.com>
Reviewed-by: DCO Verification
Reviewed-by: Alexander Irhin <alexander.irhin@lge.com>