rebar_eunit: disambiguate internal naming
rebar_eunit: disambiguate internal naming

Partially revert naming changes introduced in 93689703c1:
CoverageModules -> FilteredModules
get_coverage_modules -> get_matching_modules

Having the name "coverage" meaning "filtered/selected modules" can be
confused with code coverage.

evnix/rebar,SiDen/rebar,fabiankrol/rebar3,djnym/rebar3,paulo-ferraz-oliveira/rebar,lrascao/rebar,norton/rebar,bsmr-erlang/rebar,cloudant/couchdb-rebar,bsmr-erlang/rebar,choptastic/rebar,linearregression/rebar3,walrusVision/rebar3,ferd/rebar3,matwey/rebar,lpgauth/rebar,platinumthinker/rebar,lrascao/rebar,lrascao/rebar,evnix/rebar,K2InformaticsGmbH/rebar,SiDen/rebar,GabrielNicolasAvellaneda/rebar,evnix/rebar,blt/rebar3,scatterbrain/rebar,scatterbrain/rebar,rebar/rebar3,kellymclaughlin/rebar3,csyangchen/rebar,syl20bnr/rebar,norton/rebar,rebar/rebar3,paulo-ferraz-oliveira/rebar,choptastic/rebar,bsmr-erlang/rebar,vladdu/rebar3,rebar/rebar,lpgauth/rebar,project-fifo/rebar3,norton/rebar,jbalint/rebar3,paulo-ferraz-oliveira/rebar,lpgauth/rebar,syl20bnr/rebar,sile/rebar3,erlang/rebar3,norton/rebar,matwey/rebar,lrascao/rebar,dcarastan/rebar,rebar/rebar,matwey/rebar,benoitc/rebar3,apache/couchdb-rebar,processone/rebar3,benoitc/rebar3,fabiankrol/rebar3,RubberCthulhu/rebar,zugolosian/rebar3,matwey/rebar,macintux/rebar,CMoH/rebar,GabrielNicolasAvellaneda/rebar,bsmr-erlang/rebar,macintux/rebar,shkumagai/rebar,tsloughter/rebar3,fauxsoup/rebar3,jbalint/rebar3,linearregression/rebar3,walrusVision/rebar3,platinumthinker/rebar,syl20bnr/rebar,CMoH/rebar,oubiwann/rebar,GabrielNicolasAvellaneda/rebar,surik/rebar3,rebar/rebar,shkumagai/rebar,fishcakez/rebar3,blt/rebar3,beni55/rebar,jacktang/rebar,dcarastan/rebar,K2InformaticsGmbH/rebar,lrascao/rebar3,choptastic/rebar,csyangchen/rebar,beni55/rebar,macintux/rebar,shkumagai/rebar,processone/rebar3,SiDen/rebar,platinumthinker/rebar,sile/rebar3,project-fifo/rebar3,CMoH/rebar,oubiwann/rebar,surik/rebar3,zugolosian/rebar3,matwey/rebar,norton/rebar3,jacktang/rebar,apache/couchdb-rebar,jacktang/rebar,saleyn/rebar3,cloudant/couchdb-rebar,K2InformaticsGmbH/rebar,scatterbrain/rebar,lrascao/rebar,beni55/rebar,K2InformaticsGmbH/rebar,oubiwann/rebar,fauxsoup/rebar3,RubberCthulhu/rebar,dcarastan/rebar,csyangchen/rebar,K2InformaticsGmbH/rebar,cloudant/couchdb-rebar,apache/couchdb-rebar