comment unused functions
moving perl based unit tests to retire
new config parameter: CVMFS_DNS_SERVER
improving stopwatch
TEST: unreachable DNS failure
Merge pull request #197 from cooperative-computing-lab/master

download thread bug fix
Merge branch 'master' of github.com:cvmfs/cvmfs
changelog, cosmetics
remove DNS related configuration functions from common test functions
add a python script that opens a [TCP|UDP] socket on a specified port and stays silent on connection
remove iptables configuration from test_functions
add a shell function to test_functions that opens a silent UDP|TCP port
TEST: DNS server is available but doesn't answer
Merge pull request #198 from reneme/failover_tests

TEST: two new test cases related to DNS outages
handle partial transfer errors
TEST: failover of unreachable http hosts
FIX: disable proxies for HTTP host failover test + first check if mount worked and afterwards if time limit was exceeded
TEST: check failover chain with unresponsive HTTP mock service
cosmetics
Merge pull request #199 from reneme/http_tests

TEST: Failover chain with unresponsive or inaccessible HTTP servers