By default this feature is enabled. On the first run it will copy (if
exists) databases from filesystem to local cache (one per each
architecture). Later it will use this cache for all alpm operations. In
order to update this cache, some commands (mainly package building)
provide `-y`/`--refresh` option which has same semantics as pacman -Sy
does.
Note however that due to extending `Pacman` class some methods were
renamed in order to be more descriptive:
* `Pacman.all_packages` -> `Pacman.packages`
* `Pacman.get` -> `Pacman.package_get`
This commit also adds multilib repository to the default docker image
which was missed.
The issue appears when there is no boto, jinja and some other libraries
are not installed because the classes which use these libraries are
still being imported inside the package file. The fix removes those
imports from package root, because they should not be here, in fact,
content of report and upload packages must be imported only inside the
trigger class and only if they are actually required
This commit also adds setuptools as required dependency since it is used
for some parsers (previously it was provided dependency)
