As described in lvalert_admin broken on both conda igwn-py2 and igwn-py37 environments,
we can't install lvalert by igwn
because lvalert depends on legacy package (pyxmpp)
Tagoshi-san's note
git repository(lvalert)
LVAlert Users Guide
https://lscsoft.docs.ligo.org/lvalert/index.html
