[tests] Allow testing with latest grimoirelab component versions

This code allows to execute the tests using the latest versions
of the grimoirelab components required by ELK, thus simplyfing
the testing of features that involve more components. The
components are:
- grimoirelab-sortinghat
- grimoirelab-toolkit
- grimoirelab-cereslib
- grimoirelab-kingarthur
- grimoirelab-perceval
- grimoirelab-perceval-mozilla
- grimoirelab-perceval-opnfv
- grimoirelab-perceval-puppet

.travis.yml

@@ -12,20 +12,13 @@ services:
 before_install:
   - pip install flake8
   - pip install coveralls
-  - pip install kingarthur
-  - pip install perceval
-  - pip install perceval-mozilla
-  - pip install perceval-opnfv
-  - pip install perceval-puppet
   - pip install pandas==0.18.1
   - pip install redis
-  - pip install sortinghat
   - pip install PyMySQL
   - pip install httpretty==0.8.6
-  - pip install cereslib
   - pip install elasticsearch==5.5.1
   - pip install elasticsearch-dsl==5.3.0
-  - pip install grimoirelab-toolkit
+  - pip install -r "requirements.txt"
 
 #install:
 #   - ./setup.py install

requirements.txt

@@ -0,0 +1,11 @@
+PyMySQL
+elasticsearch>=5.5.2
+elasticsearch-dsl>=5.3.0
+-e git+https://github.com/chaoss/grimoirelab-sortinghat/#egg=grimoirelab-sortinghat
+-e git+https://github.com/chaoss/grimoirelab-toolkit/#egg=grimoirelab-toolkit
+-e git+https://github.com/chaoss/grimoirelab-cereslib/#egg=grimoirelab-cereslib
+-e git+https://github.com/chaoss/grimoirelab-kingarthur/#egg=grimoirelab-kingarthur
+-e git+https://github.com/chaoss/grimoirelab-perceval/#egg=grimoirelab-perceval
+-e git+https://github.com/chaoss/grimoirelab-perceval-mozilla/#egg=grimoirelab-perceval-mozilla
+-e git+https://github.com/chaoss/grimoirelab-perceval-opnfv/#egg=grimoirelab-perceval-opnfv
+-e git+https://github.com/chaoss/grimoirelab-perceval-puppet/#egg=grimoirelab-perceval-puppet