replace instances of dbt.exceptions with exceptions

[drewbanin]

Issue

Issue description

Some default implementations of dbt macros reference dbt.exceptions instead of exceptions, leading to errors like

'dict object' has no attribute 'exceptions'.

In many (all?) of these cases, the macro is raising a "not implemented" exception, so this is a low-impact bug, but one worth fixing for sure.

Results

dbt raises the incorrect error message

System information

The output of dbt --version:

0.13.1

Steps to reproduce

This only really happens when you try to build a new adapter.

1. create a new adapter
2. don't implement methods like list_relations_without_caching
3. run dbt

[aminamos]

Hi @drewbanin, if I look at this, which branch should I fork from? Apologies if this was addressed in the contributing file and I missed it. Thank you!

[drewbanin]

Hey @aminamos - our current development branch is dev/0.14.1. I'd branch off of there in your fork for the PR!

I'll have a think about how to better document this. Let me know if you have any questions as you dig into it!

[aminamos]

I submitted an initial pull request with the fixed macros to make sure I am on the right track. I do have one question: should I update the Python files as well?

[drewbanin]

Hey @aminamos - I'll follow up on this in the PR!