remove IO overrides

Remove defaults for CMSSW IO settings, instead use release defaults. The sites can override these in site local conf.
Updating dependencies for crabserver, crabclient and aso
Configure T1 disk sites overrride

Allow a configurable list of SEs where the Disk node
should have priority over the Buffer, this is used
by T1 sites where the Disk instance is commissioned
and uses the same SE endpoint as the Buffer instance.

It defaults to the SE of CNAF and the Disk SE of RAL. It can be configured
as:

config.PhEDExInjector.diskSites = ["storm-fe-cms.cr.cnaf.infn.it","srm-cms-disk.gridpp.rl.ac.uk"]
Implement deterministic pileup support

The EventAwareLumiBased and LumiBased splitting algorithms
will keep count of the number of jobs when deterministic
pileup is required, this allows the PSet to be tweaked
to use sequential pileup and skip the events already
used from the pileup dataset.
Add dashboard dependency to reqmgr2.
Merge pull request #4757 from ticoann/reqmgr2_dashboard_dep

Add dashboard dependency to reqmgr2.
fix WorkQueue unittest
Merge pull request #4761 from ticoann/workqueue_test_fix

fix scenario argument default value (workqueue unittest fix)
Merge pull request #4739 from dballesteros7/cnaf-disk

Configure T1 disk sites overrride
Merge pull request #4752 from dballesteros7/deterministic-pu-wmagent

Implement deterministic pileup support
Merge pull request #4637 from cinquo/master

Updating dependencies for crabserver/client and aso
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