Shorten tox target names

Due to the length limit for the shabeng line [1] the execution of
these tox targets in OpenStack-CI is failing (the full shebang
length is 130 chars).

This patch shortens the names appropriately.

[1] pypa/virtualenv#596

Change-Id: I9011eac714e40d33baff7c1a1fc6eb0fdf47df55

tox.ini

@@ -175,7 +175,7 @@ commands =
     bash -c 'rsync -av --ignore-errors /var/log/ /openstack/log/ {toxinidir}/logs/ || true'
 
 
-[testenv:func_uwsgi_apache]
+[testenv:uwsgi_apache]
 # Ignore_errors is set to true so that the logs are collected at the
 #  end of the run. This will not produce a failse positive. Any
 #  exception will be mark the run as "failed" and exit 1 after all of
@@ -199,7 +199,7 @@ commands =
     bash -c 'rsync -av --ignore-errors /var/log/ /openstack/log/ {toxinidir}/logs/ || true'
 
 
-[testenv:func_uwsgi_nginx]
+[testenv:uwsgi_nginx]
 # Ignore_errors is set to true so that the logs are collected at the
 #  end of the run. This will not produce a failse positive. Any
 #  exception will be mark the run as "failed" and exit 1 after all of