Remove transitional python*-glue packages

This MR closes #29 (closed) by removing the transitional python3-glue packages for Debian and RPM; python3-glue is a real package on Debian, which is separate to this, so we shouldn't attempt to provide it; if people haven't updated yet, shame on them.

See also

• Update package requirements on lscsoft-glue (lalsuite!2167 - merged)
• https://github.com/gwastro/sbank/pull/52