remove obsolete retry algorithm code

Remove WMCore.Algorithms.Retry and associated unit tests because the code has never been used.
Merge pull request #4766 from hufnagel/cleanup-retryalgos

remove obsolete retry algorithm code
fix to import HTTPException
Merge pull request #4770 from ticoann/httpexception_fix

fix to import HTTPException
update the creation time job splitting samples
set default stale for wq calls
Merge pull request #4775 from ticoann/couch_view_default_stale

set default stale for wq calls
Merge branch 'master' of https://github.com/dmwm/WMCore into update_request_splitting
Fixes # 4618 : Remove tableSpaces and FK Constraints
added two json templates for reqmgr client, for hg1309
Merge pull request #4777 from amaltaro/hg1309-reqmgr-templates

added two json templates for reqmgr client, for hg1309
Merge pull request #4773 from ticoann/update_request_splitting

update the creation time job splitting samples
Merge pull request #4774 from tsarangi/issuenumber4618

Fixes # 4618 : This is a fresh commit to try and fix issue 4618
support for all in one test
change Oracle constraints

A new constraint in CreateWMBSBase conflicts with an
older constraint in Oracle/Create, resolve this.
don't use WMAGENT_CONFIG env
Merge pull request #4784 from ticoann/drain_mode_monitor_fix

don't use WMAGENT_CONFIG env
Improve AnalyticsDataCollector reporting
Merge pull request #4785 from lucacopa/test_analytics

Improve AnalyticsDataCollector reporting
Improve AnalyticsDataCollector reporting
WMAgentConfig