For performance analysis, it is mandatory to keep logs for a very long
time. Also it is sometimes required to analyse a bug that happened
more than one more ago, so we have no other choices than keep logs
and not remove them.

Conflicts:
	software/kvm/software.cfg
	stack/kvm.cfg

PHP : Disable Strict mode reporting, Enable libxml in php. Warning : if libz*-dev is installed, php won't compile

As slapos.libnetworkcache does not depend on M2Crypto anymore, but on
existence of openssl in PATH drop building of this library and just
tweak slapgrid-sr environment to allow find the openssl in PATH.

http://git.erp5.org/gitweb/slapos.git/commitdiff/2edb5d390f3f8a8fb2ca2deeb355aa1eb6498796