Invalid number error when parsing line protocol with dos line endings

[danielnelson]

Bug report

Relevant telegraf.conf:

[[inputs.exec]]
   commands = ['sh -c "cat ~/telegraf.txt"']
   timeout = "25s"
   data_format = "influx"

System info:

$ ./telegraf --version
Telegraf v1.6.0~06c21fb9 (git: master 06c21fb9)

Steps to reproduce:

$ cat ~/telegraf.txt
dt,entity=SERVICE-F08D806E7EF685CF timeseriesId="com.dynatrace.builtin:service.responsetime",metric=56167.75
dt,entity=SERVICE-F08D806E7EF685CF timeseriesId="com.dynatrace.builtin:service.responsetime",metric=65166.0
$ file ~/telegraf.txt
/home/dbn/telegraf.txt: ASCII text, with CRLF line terminatorst
$ telegraf --test
2018/01/02 10:54:07 I! Using config file: /home/dbn/.telegraf/telegraf.conf
* Plugin: inputs.exec, Collection 1
2018-01-02T18:54:07Z E! Error in plugin [inputs.exec]:  invalid number invalid number

Expected behavior:

$ telegraf --test
2018/01/02 11:00:57 I! Using config file: /home/dbn/.telegraf/telegraf.conf
* Plugin: inputs.exec, Collection 1
> dt,entity=SERVICE-F08D806E7EF685CF,host=loaner timeseriesId="com.dynatrace.builtin:service.responsetime",metric=56167.75 1514919658000000000
> dt,entity=SERVICE-F08D806E7EF685CF,host=loaner timeseriesId="com.dynatrace.builtin:service.responsetime",metric=65166 1514919658000000000

Actual behavior:

2018-01-02T18:54:07Z E! Error in plugin [inputs.exec]:  invalid number invalid number

Additional info:

Changing the file to unix line endings results in correct parsing.