Three major changes were required to get this working:
1) Provide the path to pgbackrest in the build directory when running outside a container. Tests in a container will continue to install and run against /usr/bin/pgbackrest.
1) Set a per-test lock path so tests don't conflict on the default /tmp/pgbackrest path. Also set a per-test log-path while we are at it.
2) Use localhost instead of a custom host for TLS test connections. Tests in containers will continue to update /etc/hosts and use the custom host.
Add infrastructure and update harnessCfgLoad*() to get the correct exe and paths loaded for testing.
Since new tests are required to verify that running outside a container works, also rework the tests in Travis CI to provide coverage within a reasonable amount of time. Mainly, break up to doc tests by VM and run an abbreviated unit test suite on co6 and co7.
Previously only a single filter could be pushed to the remote since order was not being maintained. Now the filters are strictly ordered.
Results are returned from the remote and set in the local IoFilterGroup so they can be retrieved.
Expand remote filter support to include all filters.
If the file is compressible (i.e. not encrypted or already compressed) it can be marked as such in storageNewRead()/storageNewWrite(). If the file is being read from/written to a remote it will be compressed in transit using gzip.
Simplify filter group handling by having the IoRead/IoWrite objects create the filter group automatically. This removes the need for a lot of NULL checking and has a negligible effect on performance since a filter group needs to be created eventually unless the source file is missing.
Allow filters to be created using a VariantList so filter parameters can be passed to the remote.
This filter exactly mimics the behavior of the Perl filter so is a drop-in replacement.
The filter is not integrated yet since it requires the Perl-to-C storage layer interface coming in a future commit.
Remove "File" and "Driver" from object names so they are shorter and easier to keep consistent.
Also remove the "driver" directory so storage implementations are visible directly under "storage".
Removed the "anchor" parameter because it was never used in any calls in the Perl code so it was just a dead parameter that always defaulted to true.
Contributed by Cynthia Shang.
