remove needless -y flag, dpkg doesn't prompt

aegir_6.x-2.x-deb_install.py

@@ -50,7 +50,7 @@ def fab_install_debs(debs):
         for deb in debs:
                 print "===> Uploading deb " + deb
                 fabric.operations.put(deb, '')
-        fabric.run("DPKG_DEBUG=developer DEBIAN_FRONTEND=noninteractive dpkg -i aegir*.deb -y", pty=True)
+        fabric.run("DPKG_DEBUG=developer DEBIAN_FRONTEND=noninteractive dpkg -i aegir*.deb", pty=True)
         # Install aegir, but ensure that no questions are prompted.
         #fabric.run("DPKG_DEBUG=developer DEBIAN_FRONTEND=noninteractive apt-get install aegir -y", pty=True)