Fix packaging of the tests directory (#1215)

Do not install tests as a package, but instead include it only in the
source tarball via MANIFEST.in.

I have verified that the resulting tarball installs only the 'atlassian'
package into site-packages and that the included files are sufficient to
successfully run the tests.

Fixes #1206

Signed-off-by: Ondrej Mosnáček <omosnacek@gmail.com>

MANIFEST.in

@@ -2,4 +2,5 @@ include atlassian/VERSION
 include LICENSE
 include README.rst
 include tox.ini
-include requirements.txt
+include requirements.txt
+recursive-include tests *

setup.py

@@ -21,8 +21,8 @@
     maintainer_email="gonchik.tsymzhitov@gmail.com",
     url="https://github.com/atlassian-api/atlassian-python-api",
     keywords="atlassian jira core software confluence bitbucket bamboo crowd portfolio tempo servicedesk assets api",
-    packages=find_packages(include=["atlassian*", "tests*"]),
-    package_dir={"atlassian": "atlassian", "tests": "tests"},
+    packages=find_packages(include=["atlassian*"]),
+    package_dir={"atlassian": "atlassian"},
     include_package_data=True,
     zip_safe=False,
     install_requires=["deprecated", "requests", "six", "oauthlib", "requests_oauthlib"],