tree d65549863625f40a77b21a92f4fb8a9d3aa30a73
parent e97870c6411c22f658c450ecf0f9cf974bfd888f
author Matthew Treinish <mtreinish@kortar.org> 1435769201 -0400
committer Matthew Treinish <mtreinish@kortar.org> 1436283253 -0400
gpgsig -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v2
 
 iQIcBAABCgAGBQJVm/F2AAoJEP0SoPIUyeF3yJ8P/iVJ2/5unxJjsNdJLCLg3GpG
 jxdfSRluM5RNj5FKL8wkNZkebXVpotUBuWd1wJwIIKAvoHt6a9o+5jxfOleyXLo2
 kPfE72u5rnScfB1YXxobnbsHjJ57oKOVi2l8LRpIU5Pd8O6WEj/9oRIMEKQkywFs
 86cp4fAB9ovzLawU2ogIZV8ggFNNkLVb/zkwpSUCKmyGEksvJjuWswmCLm/v1t+l
 UliWAhO9fKp2aD15yOXh98fp8AzXp49SHpV5x4KL+Gi77siVez4URHbR4a9S4/7J
 /39n1ml1LZfdpN62DXUb6iGI2Ike4d0uDfTd2WD4fJ/PXGinAZrEVDKYYNq4ZJco
 YPWcxse0uvmG2M3lGTAkp/3neqd5ciq+Docq3rMEfdTVVflq1Jcm8K0l+pKZ45q4
 F4gu5sPR603ErzOYxEc2u7vos2et5vRuQcclUFfZPDT1/fXV33gPkOw2uYSsj/OF
 JzJJp1lWdVhR+tl67dAGlAnk/Ml8GWt8S1o4vNYCNHzDc0T0BXkqdupUqhg5cWru
 OKndi9tlDyoSv7XahIkstC7iDJg/TV4ypsE6M/RNV4kgjqMUYFPEOLbSsgjzaFND
 zMIZClCcKelq3MyLtB1oLVRCMiBSqD1aWVVYkH+A5bWz+gmQsBdqVRYYk4WI0UdI
 4XIa5duovNDGUMNArlVx
 =iRjN
 -----END PGP SIGNATURE-----

Add basic external test plugin support to tempest

This commit starts the basic framework for using external plugins in
tempest. It adds a new singleton class to load the plugins once from
stevedore and also provides an interface for different steps in the
tempest execution to use plugins as well as in-tree code.

As part of this an ABC abstract class is created to simplify the
plugin side creation. Eventually the expectation is that this
abstract class will live in tempest-lib. But, for right now while
this feature is still experimental and under development this will
likely change frequently so it'll live in tempest for the time being.

Partially Implements bp external-plugin-interface

Change-Id: I8ebabdb4ce9f4d3b3aca375158835f907d5ca315