Update psutil version to >= 3.0.1

This bumps the psutil requirement to >= 3.0.1 to match the new upper
constraint in the global requirements [1]. This also removes the local
capping of psutil to version 3.0.1.

Removing the 3.0.1 cap is also necessary to run the agent in
environments using the musl libc, such as Alpine Linux, due to an issue
resolved in more recent releases [2].

[1]: https://review.openstack.org/#/c/420837/
[2]: giampaolo/psutil#664

Change-Id: If811db1aeac7cb7b37c710f1ba79568d7beb101f

requirements.txt

@@ -13,7 +13,7 @@ gevent>=1.1.1
 httplib2>=0.7.5 # MIT
 netaddr>=0.7.13,!=0.7.16 # BSD
 ntplib>=0.3.2,<0.4
-psutil<3.1.0
+psutil>=3.0.1 # BSD
 pymongo>=3.0.2,!=3.1
 python-memcached>=1.56 # PSF
 python-monascaclient>=1.1.0 # Apache-2.0

tools/tox_install.sh

@@ -25,10 +25,7 @@ pip install -c"$localfile" openstack-requirements
 # the current repo. It is listed in constraints file and thus any
 # install will be constrained and we need to unconstrain it.
 
-# NOTE(dmllr): temporary local uncaping of psutil in upper-constraints
-# if it is still 1.x. Remove me when https://review.openstack.org/#/c/333717/
-# merges
-edit-constraints "$localfile" -- "$CLIENT_NAME" psutil===3.0.1
+edit-constraints "$localfile" -- "$CLIENT_NAME"
 
 pip install -c"$localfile" -U "$@"
 exit $?