build-appliance-image: include proxy on pip3 installation
Otherwise, we get timeouts, leading to errors:
pip._vendor.requests.exceptions.ConnectTimeout: HTTPSConnectionPool(host='pypi.python.org', port=443): Max retries exceeded with url: /pypi/pip/json (Caused by ConnectTimeoutError(<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7ff741bb3ef0>, 'Connection to pypi.python.org timed out. (connect timeout=5)'))
WARNING: TOPDIR/tmp/work/qemux86-poky-linux/build-appliance-image/15.0.0-r0/temp/run.do_populate_poky_src.185123:1 exit 1 from 'pip3 install --user -I -U -v -r TOPDIR/tmp/work/qemux86-poky-linux/build-appliance-image/15.0.0-r0/rootfs/home/builder/poky/bitbake/toaster-requirements.txt'
DEBUG: Python function do_image finished
Complete log at [1]
[1] http://errors.yoctoproject.org/Errors/Build/43393/
Signed-off-by: Leonardo Sandoval <leonardo.sandoval.gonzalez@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
