Add zope-username and zope-password options into the recipe erp5_bootstrap.
'zope-username' and 'zope-password' are harcoded on the buildout-side,
because the (https) 'zope-url' no longer include these informations.

(cherry picked from commit 9b3092348a4056e4c19caf4be01220d76da9fdbb)

(cherry picked from commit 2c9dfd0b732d24d5fa3adf99fd337ac45d8fec66)

(cherry picked from commit b2b7a123ebed4d962b08b6a1fd8565d5d66195b3)

Noticed by Benjamin.
(cherry picked from commit e51770f440db737f4904a24cb4d3180d422b0702)

Scalability: test

scalability: fix md5

scalability: Fix command-line launcher binary path

scalability: fix testsuite name

scalability: test

Update code

Simplifies editing the software release by removing the need to edit
instance-erp5-cluster.cf.in each time.
Applied to kumofs, cloudooo, mariadb and zodb.
Partially applied to frontend, as it is more complex.
Not applied to zope, as it is even more complex - but also topical to this
software release.
Also, change default timezone to UTC, to be neutral.
Also, reformat section extension.