vagrant: change how anaconda packages are tested

Will now install latests Pyrocko from Anaconda and test against tests
from latest tag in repos.

maintenance/vagrant/centos-7-anaconda-3/inside.sh

@@ -40,8 +40,11 @@ cd "$pyrockodir"
 ln -s "/vagrant/pyrocko-test-data" "test/data"
 ln -s "/vagrant/example_run_dir" "test/example_run_dir"
 
+# using current anaconda install from internet with tests at current release
+most_recent_tag=`git tag | tail -n 1`
+git checkout "$most_recent_tag"
+
 #python setup.py install -f && \
-# using anaconda install with new tests...
     python -m pyrocko.print_version deps >> "$outfile_py3" && \
     python -m nose "$thetest" > >(tee -a "$outfile_py3") 2> >(tee -a "$outfile_py3" >&2) || \
     /bin/true