remove extraneous +x bits from lib files

2 files had execute bits set on them, fix as a cleanup. These files
should not be directly executed.

Change-Id: Ic0fdb85d77a3b47ef777524faf4fcdb0d8cedece
diff --git a/lib/glance b/lib/glance
old mode 100755
new mode 100644
diff --git a/lib/neutron-legacy b/lib/neutron-legacy
old mode 100755
new mode 100644