Add "status" to Import Devices

[candlerb]

I would like to be able to import "comments" as part of bulk device import. Also device "status" (Active or Offline)

Related:

• Bulk import custom fields #568 - Bulk import custom fields
• Convert CSV import/export to use headers #655 - Convert CSV import to use headers

If #655 were implemented, then presumably it would be trivial to allow all fields of the device to be imported.

[jeremystretch]

I've shied away from enabling the import/export of free-form comments because we may run into issues concerning line breaks and formatting. I'm sure it's workable, I just haven't had the time to test it.

[candlerb]

Should be OK now #422 is done I think

[jeremystretch]

We still need to devise a method for dealing with line breaks in comments.

[candlerb]

The CSV format supports it by means of line breaks within quoted fields, even though such CSV files aren't amenable to normal line-oriented Unix tools like grep.

e.g. a cell with a line-break in Excel:

Exported as CSV:

$ cat Workbook1.csv
"Foo
Bar"

$ hexdump -C Workbook1.csv
00000000  22 46 6f 6f 0a 42 61 72  22                       |"Foo.Bar"|
00000009

Imported into Python:

>>> import csv
>>> for r in csv.reader(open('Workbook1.csv')): print repr(r)
...
['Foo\nBar']
>>>

[jeremystretch]

I'm limiting the scope of this issue to the addition of the "status" field. We don't currently support the importation of comments for any models; that can be addressed separately in the future.