JFG-484

+ RandomLoadBalancer
+ schema: add randomSeed field for distributors
docu about randomSeed attribute of queryDistributorRandomAbstract complexType
Create metrics services
Merge branch 'master' of https://github.com/griddynamics/jagger into ServicesPrototype
Add test-group listeners
JFG-530 - docu for distributors, providers expanded
JFG-470 - docu for property file expanded
JFG-550 - nonexisting repository is removed from pom.xml
Merge pull request #309 from amikryukov/JFG-484-st

JFG-484 new RandomLoadBalancer
Merge remote-tracking branch 'grid/master'
WebUi fixes
+ disable menu of columns
+ table do not show() and then expand - width of columns calculates at begining.
Merge pull request #320 from MysterionRise/master

Remove dead repo from parent pom.xml, remove guava in one place to give ...
Merge pull request #318 from amikryukov/metric-servises-revert

Create metric services JFG-540
[maven-release-plugin] prepare release parent-1.2.3-m1
[maven-release-plugin] prepare for next development iteration
Merge pull request #322 from dlatnikov/JFG_470_530_550_docu_improvement

JFG-530 - docu for distributors, providers expanded
- Expanded logging (info about agent timeouts, DB logging, monitor process control, agent - kernel communication)
- SamplingProfilerImpl - deleted shutdown for ThreadPoolExecutor
- Deleted unused property from environment.properties file
Merge branch 'grid_master_for_merging' into JFG_542_recreating_thread_executor_in_loop
Snapshot version changed, toString added to Timeout class
timeout (poll interval) update
modifications for correct docu generation
Merge pull request #326 from dlatnikov/JFG_542_recreating_thread_executor_in_loop

Jfg 542 recreating thread executor in loop