Configuration format changes for collector and query-engine

They now take configuration in the standard ini format.
Default configuration file is read off /etc/contrail/collector.conf and
/etc/contrail/query-engine.conf

One can override the values from the config file through command line option
as well. e.g. --DEFAULT.log_level=DEBUG

Use --help to see various options available. Package build also places the
default config files under /etc/contrail/.

When changes are made to the configuration file, the process must be _restarted_
to take effect. (e.g. service supervisord-analytics restart).
Do not process collectors list of if it matches the default value
use 0.0.0.0 as listen address by default
Configuration format changes for collector and query-engine

They now take configuration in the standard ini format.
Default configuration file is read off /etc/contrail/collector.conf and
/etc/contrail/query-engine.conf

One can override the values from the config file through command line option
as well. e.g. --DEFAULT.log_level=DEBUG

Use --help to see various options available. Package build also places the
default config files under /etc/contrail/.

When changes are made to the configuration file, the process must be _restarted_
to take effect. (e.g. service supervisord-analytics restart).
Do not process collectors list of if it matches the default value
use 0.0.0.0 as listen address by default
Merge remote branch 'github/configuration_ini_format' into configuration_ini_format
Merge remote branch 'github/master' into configuration_ini_format
Fixing db_handler_test to accomodate bugfix b1742eaf53901ed1d172ebdfa084dcf3a31be863
Merge remote branch 'github/master' into configuration_ini_format
Merge remote branch 'github/master' into configuration_ini_format
When running code coverage for analytics systest, we should also run it across analytics unit test , gendb unit test and query_engine unit test.
Merge remote branch 'github/master' into configuration_ini_format
Merge pull request #437 from Juniper/configuration_ini_format

Configuration ini format
Pass secondary collector as --DEFAULT.collectors in qed command line args
Merge pull request #464 from Juniper/ananth_bugfix

Pass secondary collector as --DEFAULT.collectors in qed command line arg...
Merge pull request #460 from Juniper/anishm_allcov

Anishm allcov
Fix failure in test_agent_init. Initialize the vhost and xen_ll interface prefix during AgentParam::Init
Merge pull request #465 from Juniper/ashoksr_ut

Fix failure in test_agent_init. Initialize the vhost and xen_ll interfac...
Reset flow teardown_time on delete of flow_entry after its value is exported, so that it points to right value in case of flow entr reuse.