switch ishmael over to misc-web-lb.eqiad

pre-requisite for I653e1b303d76f to put
ishmael.wikimedia.org behind misc. varnish

but, bblack, let me know if you really want me to
keep using CNAMEs as we have done in the past.

i could also make it "A 208.80.154.241 ; misc-web-lb.eqiad"
as we do for phabricator, even if i don't need a separate MX

because you said those things about CNAMEs in general...

Change-Id: I1e7d16349e29573533d02f75c2104c7e4644afe8