billing fixtures: Normalize account_name values in fixtures.
billing fixtures: Normalize account_name values in fixtures.

rht/zulip,eeshangarg/zulip,zulip/zulip,andersk/zulip,rht/zulip,eeshangarg/zulip,kou/zulip,hackerkid/zulip,kou/zulip,punchagan/zulip,punchagan/zulip,zulip/zulip,zulip/zulip,kou/zulip,andersk/zulip,andersk/zulip,rht/zulip,punchagan/zulip,punchagan/zulip,punchagan/zulip,hackerkid/zulip,zulip/zulip,eeshangarg/zulip,punchagan/zulip,zulip/zulip,andersk/zulip,eeshangarg/zulip,hackerkid/zulip,andersk/zulip,kou/zulip,rht/zulip,andersk/zulip,zulip/zulip,eeshangarg/zulip,rht/zulip,rht/zulip,hackerkid/zulip,zulip/zulip,eeshangarg/zulip,punchagan/zulip,hackerkid/zulip,hackerkid/zulip,eeshangarg/zulip,kou/zulip,kou/zulip,hackerkid/zulip,kou/zulip,rht/zulip,andersk/zulip