move the pip command to common section again

Issue-ID: TEST-211
Change-Id: I446b4d65c132a2eb62b0d55651b0a21e80c485f2
Signed-off-by: DR695H <dr695h@att.com>
diff --git a/robotframework-onap/tox.ini b/robotframework-onap/tox.ini
index f7276b4..08ebf48 100644
--- a/robotframework-onap/tox.ini
+++ b/robotframework-onap/tox.ini
@@ -9,13 +9,13 @@
 deps =
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/test-requirements.txt
+install_command = pip install {opts} {packages}
 
 [testenv:pep8]
 basepython = python3
 changedir = {toxinidir}
 commands =
   flake8 --max-line-length 120 {[tox]modules}
-install_command = pip3 install {opts} {packages}
 
 [testenv:pylint]
 basepython = python3
@@ -24,7 +24,6 @@
     pylint
 commands =
     pylint -f parseable --ignore-imports=y --disable=locally-disabled --max-line-length 120 --exit-zero -ry {[tox]modules}
-install_command = pip3 install {opts} {packages}
 
 [testenv:py3]
 basepython = python3
@@ -36,10 +35,8 @@
   --cover-xml \
   --cover-html \
   tests
-install_command = pip3 install {opts} {packages}
 
 [testenv:py27]
 basepython = python2.7
 commands =
   nosetests --all-modules tests
-install_command = pip install {opts} {packages}
\ No newline at end of file