Update tests/nginx-tests/nginx-tests/lib/Test/Nginx.pm

set prefix when start nginx
Merge branch 'master' of github.com:yzprofile/tengine
format the test case code
Merge pull request #161 from yzprofile/master

set prefix when start nginx
1 perform unlink before copy dso module.
2 add some module to default all modules.
3 remove some dead code.
Merge pull request #165 from monadbobo/dso_fix2

optimize dso module
fix install error  when install dso.
unify the way of condition command  when install dso.
Merge pull request #166 from monadbobo/dso_fix2

fixed install error when install dso.
remove the cached connection from the upstream retrying function
Merge branch 'fix_keepalive_retry' into CDN