fix(docker): add libsasl2-2 to images

[suchapalaver]

Fixes #719

Signed off by Joseph Livesey [email protected]

[neithanmo]

Thanks for this!!

[neithanmo]

I think we should unify images, they are not that different.
However the only inconvenience is that the ones in contrib contains more stuffs that final users might not need

[coveralls]

Pull Request Test Coverage Report for Build 15029736174

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.04%) to 73.038%

---

Totals
Change from base Build 15020909739:	0.04%
Covered Lines:	8812
Relevant Lines:	12065

---

💛 - Coveralls

[suchapalaver]

I think we should unify images, they are not that different. However the only inconvenience is that the ones in contrib contains more stuffs that final users might not need

I think first step we should put in place is a test that the images build and I like the idea about unifiying a builder for these images!