Do not fail the build when a mirror is not found

Forgot to include this check in the change 4c9db8e41b3b546a52.
netselect checks for the mirrors from the list and when one
or more mirrors are not available returns the below error
causing the build to fail.

error:
netselect: unknown host gpl.savoirfairelinux.net/pub/mirrors/ubuntu/

Issue: RELENG-2642
Change-Id: I4351a40be996092febe4efe956b18a9a575c994e
Signed-off-by: Anil Belur <abelur@linuxfoundation.org>

diff --git a/provision/install-python.sh b/provision/install-python.sh
index 464f318..040f8ba 100755 (executable)
--- a/provision/install-python.sh
+++ b/provision/install-python.sh
@@ -38,7 +38,9 @@ if is_ubuntu; then
     apt install wget -y
     wget http://ftp.au.debian.org/debian/pool/main/n/netselect/netselect_0.3.ds1-26_amd64.deb
     dpkg -i netselect_0.3.ds1-26_amd64.deb
+    set +e # DO NOT cause build failure if any mirrors are not reachable.
     netselect -s 20 -t 40 "$(wget -qO - mirrors.ubuntu.com/mirrors.txt)"
+    set -e
     sed -i 's/http:\/\/us.archive.ubuntu.com\/ubuntu\//http:\/\/ubuntu.uberglobalmirror.com\/archive\//' /etc/apt/sources.list
 
     echo "Installing python-minimal..."