AK5 to AK4 for JEC's, Redux

[rappoccio]

Update of PR #5299, including suggestions from @Martin-Grunewald and
@mmarioncern.

Here is the last expected change for the AK5 -> AK4 transition. The
AK4 and AK8 global tags are now present at RECO and HLT level. I have
moved the defaults from AK5/AK7 to AK4/AK8 now. I also added services
for ALL available payloads (AK1,2,3,...10). The "default" is AK4.

I have coordinated with JME Trigger contacts to include the requisite
changes to CondDB for the HLT-related software changes. However, this
will still break the Run 1 matrix tests (5.1 and 25.0) with this
current PR.

Additional changes were made to fix unit tests by changing the global
tag from "startup" to "run2_mc", which fixed the broken unit tests.

Tested on the following workflows :

• Working : 4.22, 4.53, 8.0, 1000.0, 1001.0, 1341.0, 25202.0
• Broken : 5.1, 25.0

[slava77]

@rappoccio
Sal, what are the actual changes that you intended to add here?
70K lines change sounds to be well beyond the scope of
AK5 to AK4 for JEC's

(considering that github occasionally shows more than there really is, I tried to merge locally and see diffs

CMSSW_7_2_X_2014-09-24-1400 
git cms-merge-topic cms-sw:CMSSW_7_2_X
#  260 files changed, 8811 insertions(+), 60591 deletions(-)
# most of the above is from #5421, anyways, your topic branch head is out of sync
git cms-merge-topic  5350
# 29 files changed, 571 insertions(+), 163 deletions(-)

I'm guessing the last one is actually the needed stuff, not the 60K lines

Could you please rebase

[rappoccio]

@slava77 yes, sorry, I have a rebase. Should I close this PR and open a new one or use this one?

[slava77]

you can try here, you will see if the history come out cleaner (I have my doubts ;) )
If it will, the irrelevant signatures should go away and the web-based diff should become much smaller

.. if not, make a new one

[rappoccio]

OK merged here. It doesn't seem to have gotten cleaner hehehehe.

I will make a new PR then.

[rappoccio]

For the record : new PR is #5588.