repro: add RTLD_GLOBAL to dlopen for plugins

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10753 ddefafc4-47db-0310-ae44-fa13212b10f2
travis: use python2.7-config to get *FLAGS for python

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10754 ddefafc4-47db-0310-ae44-fa13212b10f2
repro: pyroute plugin: add method and some headers to python call

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10755 ddefafc4-47db-0310-ae44-fa13212b10f2