added comments to tables in management.database.

adjusted test/database.py to changes made in earlier commits.

queried for, but uuid and module name.

database will be updated before the message has been sent.

Added code to update the method field of the log table after message has
been sent.

Added method RestModule.log_update_method() in order to update method
field in log table.

added method to update method field.

Adapted to changes in deployit.config.

Added context manager.

Table 'agent' renamed to 'managementagent'.

Added method get_resource_status().

Added method add_resource_status().

managementhost.database.Database.get_module_logs().

logs for a particual module.

Added convenience methods
managementhost.restmodules.RestModule.(log_to_database|get_log_from_database|get_module_logs)().

Removed database initialization from
managementhost.restmodules.RestModule, since it does not play nicely with
threads.

modules/.

to rabbit.

Rabbit server and create an exchange using the resourcename.

Adjusted restmodules.py to integer version numbers in modules.

Database python module can write and retrieve logs so far.

The ping module is used to discover all Management Agents.