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Add check for empty string as Member.alias on Room/add request. Add test (add_many_members/0) for this case (#4341)

Delete alias increment on member/update. Update room_test:check_alias test: add case with Member/update. Comment inc_alias as excessive func (#3476)

# Conflicts:
#	apps/roster/src/roster_db.erl

# Conflicts:
#	apps/roster/src/roster_data.erl
#	apps/roster/src/roster_test.erl
#	charts/messaging-service/templates/serviceentry.yaml

# Conflicts:
#	apps/roster/src/roster_test.erl

# Conflicts:
#	apps/roster/src/roster_test.erl