CLI was caching db/rp for insert into statements

[corylanou]

Before:

> create database foo
> use foo
Using database foo
> insert cpu value=1
> insert into badrp mem value=100
Using retention policy badrp
ERR: {"error":"retention policy not found: badrp"}

> insert cpu value=2
ERR: {"error":"retention policy not found: badrp"}

After:

> create database foo
> use foo
Using database foo
> insert cpu value=1
> insert into badrp mem value=100
ERR: {"error":"retention policy not found: badrp"}

> insert cpu value=2
> insert into autogen mem value=100
> select * from cpu
name: cpu
time                value
----                -----
1481123342516456239 1
1481123351091949866 2

> select * from mem
name: mem
time                value
----                -----
1481123368541597661 100

Required for all non-trivial PRs

• Rebased/mergable
• Tests pass
• CHANGELOG.md updated
• InfluxData Documentation: Remove insert into note docs.influxdata.com-ARCHIVE#914

[joelegasse]

Have you filed a docs issue to remove the note at the end of the insert section on the CLI page?

https://docs.influxdata.com/influxdb/v1.1/tools/shell/#write-data-to-influxdb-with-insert