dev-python/pytest: Add logilab-common as blocker

dev-python/logilab-common was removed from the SDK in chromium:1148789
but some users still have it installed. The new version of pytest has a
file collision with that package, so add this blocker so that anyone who
still has the package doesn't hit an error when trying to update their
chroot.

BUG=chromium:934414
TEST=`emerge dev-python/pytest`

Change-Id: I0118e78d1d4d607ac445736b29129bc77f67981e
Reviewed-on: https://chromium-review.googlesource.com/1575623
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Chris McDonald <cjmcdonald@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
diff --git a/dev-python/pytest/pytest-4.4.0-r1.ebuild b/dev-python/pytest/pytest-4.4.0-r1.ebuild
new file mode 120000
index 0000000..9d3c8c2
--- /dev/null
+++ b/dev-python/pytest/pytest-4.4.0-r1.ebuild
@@ -0,0 +1 @@
+pytest-4.4.0.ebuild
\ No newline at end of file
diff --git a/dev-python/pytest/pytest-4.4.0.ebuild b/dev-python/pytest/pytest-4.4.0.ebuild
index 6e6297e..ca274c7 100644
--- a/dev-python/pytest/pytest-4.4.0.ebuild
+++ b/dev-python/pytest/pytest-4.4.0.ebuild
@@ -30,7 +30,8 @@
 	>=dev-python/py-${PY_VER}[${PYTHON_USEDEP}]
 	>=dev-python/setuptools-40[${PYTHON_USEDEP}]
 	>=dev-python/six-1.10.0[${PYTHON_USEDEP}]
-	virtual/python-funcsigs[${PYTHON_USEDEP}]"
+	virtual/python-funcsigs[${PYTHON_USEDEP}]
+	!dev-python/logilab-common"
 
 # flake & pytest-capturelog cause a number of tests to fail
 DEPEND="${RDEPEND}