Extract Jira configuration

Instead of reading the plugin configuration in the facade, extract the
handling of the configuration to its own class (with its corresponding
tests).

Besides keeping the separation of concerns between classes, this helps
implementing multi Jira server capabilities, which is done in a follow
up commit.

Change-Id: I63a0b997d241fb520715c29bc8bd46e3907168a9
7 files changed
tree: 0b576be37dbd7d9170a2699320f234ca343901f1
  1. .gitignore
  2. .settings/
  3. BUILD
  4. LICENSE
  5. external_plugin_deps.bzl
  6. src/