Update cfengine3 to 3.7.3.

Behaviour changes:
- classesmatching(): order of classes changed
- Suppress standard services noise on SUSE

Fixes:
- Reduce verbosity of yum package module
- Reduce verbosity of apt_get package module
- Upgrade dependencies to latest patch versions.
  Upgraded libraries:
  - curl 7.47.0
  - libxml2 2.9.3
  - LMDB 0.9.18
  - MySQL 5.1.72
  - OpenLDAP 2.4.44
  - OpenSSL 1.0.2g
  - PCRE 8.38
  - PostgreSQL 9.3.11
  - Redis 2.8.24
  - rsync 3.1.2
  PHP was kept at 5.6.17 because of problems with the 5.6.19 version.
- parse def.json vars, classes in C
- Namespaced classes can now be specified on the command line.
- getvalues() will now return a list also for data containers,
  and will descend recursively into the containers.
- @if minimum_version now correctly ignores lines starting with '@'
- Fix definition of classes from augments file
- Don't follow symbolic links when copying extended attributes.
- Fix ps options for FreeBSD to check processes only in current
  host and not in jails
- Fix cf-serverd error messages with classic protocol clients
- The isvariable() function call now correctly accepts all
  array variables when specified inline. Previously it would not
  accept certain special characters, even though they could be
  specified indirectly by using a variable to hold it.
- Show errors regarding failure to copy extended attributes
  when doing a local file copy. Errors could happen when copying
  across two different mount points where the support for extended
  attributes is different between the mount points.
- Fix bad option nlwp to vzps on Proxmox / OpenVZ.
- Fix file descriptor leak when there are network errors.
- Fix a regression which would sometimes cause "Permission
  denied" errors on files inside directories with very restricted
  permissions.
- Check for empty server response in RemoteDirList after
  decryption
- Allow def.json up to 5MB instead of 4K.
- Add guard for binary upgrade during bootstrap
- Fix HP-UX specific bug that caused a lot of log output to
  disappear.
- Fix a bug which sometimes caused package promises to be
  skipped with "XX Another cf-agent seems to have done this since
  I started" messages in the log, most notably in long running
  cf-agent runs (longer than one minute).
- Define (bootstrap|failsafe)_mode during update.cf when triggerd
  from failsafe.cf
- Fix two cases where action_policy warn still produces errors
- Fix classes being set because of hash collision in the
  implementation.
- fix build failure on FreeBSD 7.1
- Installing packages containing version numbers using yum
  now works correctly.


(fhajny)