Hook the rename() and renameat() syscalls.
Refactor rename() hook to use autofill on exit.
Refactor renameat() arguments into the exit handler.
EPEL 7 is out of beta
Fix install for CentOS 7.0.1406

    * Add extra case to the rpm_install to catch the latest centos
      - fixes install errors due to package key
      - points centos to specific location for epel-release
      - points other RHEL to own location for epel-release
Fix install for CentOS 7.0.1406

Conflicts:
	scripts/install-sysdig.in
Merge master into feature/rename-syscall branch.
Case shouldn't fall through to rename case.
Merge pull request #246 from dhbaird/feature/rename-syscall

Hook the rename() and renameat() syscalls.
Add `symlink(at)?` syscalls. Add `evt.abspath` filter field.

This commit adds support for the following syscalls:

- symlink
- symlinkat

In addition to those syscalls a new set of filter fields was added:

- evt.abspath
- evt.abspath.src
- evt.abspath.dst

Those field are only used for the syscall `symlinkat` but might be
later used for other `...at` syscalls as well (e.g. `renameat`,
`openat`, `linkat` and `unlinkat`). The purpose of the filter fields
is to aggregate the values of corresponding `dirfd` and `name`
parameters to form an absolute path.
Remove unimplemented syscalls from `evt.abspath` filter.
Conform to coding conventions.
Add `evt.abspath` support for `openat`, `linkat` and `unlinkat`.
Merge pull request #260 from danielwippermann/feature/symlink_and_abspath

Add `symlink(at)?` syscalls. Add `evt.abspath` filter field.
make sure sinsp_filter_check_event::extract_abspath has a valid thread info
Merge branch 'master' into dynamic_snaplen_2
new public API method: set_min_log_severity