Support multiple comment ids for `comment (spam|trash|approve)` et al
Support multiple comment ids for `comment (spam|trash|approve)` et al

From https://wordpress.slack.com/archives/cli/p1443138041000281

trepmal/wp-cli,macbookandrew/wp-cli,gedex/wp-cli,aaemnnosttv/wp-cli,miya0001/wp-cli,anttiviljami/wp-cli,duncanjbrown/wp-cli,gitlost/wp-cli,rodrigoprimo/wp-cli,aaemnnosttv/wp-cli,gitlost/wp-cli,miya0001/wp-cli,GaryJones/wp-cli,GaryJones/wp-cli,nyordanov/wp-cli,borekb/wp-cli,shawnhooper/wp-cli,rodrigoprimo/wp-cli,2ndkauboy/wp-cli,aaemnnosttv/wp-cli,2ndkauboy/wp-cli,macbookandrew/wp-cli,rodrigoprimo/wp-cli,gitlost/wp-cli,boonebgorges/wp-cli,trepmal/wp-cli,anttiviljami/wp-cli,duncanjbrown/wp-cli,shawnhooper/wp-cli,shawnhooper/wp-cli,borekb/wp-cli,nyordanov/wp-cli,borekb/wp-cli,nyordanov/wp-cli,gedex/wp-cli,gedex/wp-cli,macbookandrew/wp-cli,2ndkauboy/wp-cli,duncanjbrown/wp-cli,miya0001/wp-cli,boonebgorges/wp-cli,trepmal/wp-cli,GaryJones/wp-cli,anttiviljami/wp-cli,boonebgorges/wp-cli