Fixed variable casing for ecn and qdisc option strings

Shell variables are supposed to be all upper-case, so fixed the badly camel-cased
eECN and iECN (EECN, IECN) as well as eqdisc_opts and iqdisc_opts
(EQDISC_OPTS, IQDISC_OPTS); retained the underscores to keep the last to readable.
All changes tested under 3.10.28-1.