Add storage_raw_read_fixed_disk_cond function

This is a conditional version of the function,
allowing it to be called from a tunable policy.
It will only work is the associated typeattribute
is, independently, applied to the domain.
Introduce lvm_use_api_cond

This function allow a domain to use directly the C API
in order to get information about the lvm instances

This function is made to work in a tunable_policy,
but requires fixed_disk_raw_read to be associated with
the domain allowed to call the C API
phpfpm: add new booleans

- phpfpm_can_network_connect_http
- phpfpm_can_read_generic_certs
- phpfpm_can_clamav_connect_unix
Collectd: support various modules via booleans

Newly supported modules are:
- entropy
- hddtemp
- lvm
- nut
- process
- users
Collectd: add support for openvpn module
Collectd: add access to /etc/mtab (etc_runtime_t)
Collectd: add support for turbostat module
Collectd: introduce collectd_read_data
phpfpm: add boolean for reading collectd data