Add curl to bindep

This is used by tools/tox_install.sh.

Change-Id: Ib9f9fc214c27c5ba647f8abcb4b558a229f1f1fa

bindep.txt

@@ -2,6 +2,7 @@
 # install and tests
 # see http://docs.openstack.org/infra/bindep/ for additional information.
 
+curl
 multipath-utils [platform:dpkg rpm]
 sg3-utils [platform:dpkg]
 sg3_utils [platform:rpm]

tools/tox_install.sh

@@ -16,7 +16,7 @@ localfile="$VIRTUAL_ENV/log/upper-constraints.txt"
 if [[ "$CONSTRAINTS_FILE" != http* ]]; then
     CONSTRAINTS_FILE="file://$CONSTRAINTS_FILE"
 fi
-# NOTE(tonyb): need to add curl to bindep.txt if the project supports bindep
+
 curl "$CONSTRAINTS_FILE" --insecure --progress-bar --output "$localfile"
 
 pip install -c"$localfile" openstack-requirements