OpenVAS Scanner v5.1.2

This is the second maintenance release of the openvas-scanner 5.1 module
for the Open Vulnerability Assessment System 9 (OpenVAS-9).

Many thanks to everyone who has contributed to this release:
Hani Benhabiles, Björn Ricks, Michael Wiegand, and Juan José Nicola.

Main changes compared to 5.1.1:

• Plugin scheduling has been improved.
• An issue which caused segmentation faults under certain circumstances when
  openvas-scanner was built with GnuTLS < 3.3.0 has been addressed.
• The use of hostname and IP while logging has been made more consistent.
• An issue which caused NVTs to be executed out of sequence has been addressed.
• An issue which caused the main scanner process to terminate prematurely when
  receiving a SIGHUP signal under certain circumstances has been addressed.
• Increased dependency for openvas-libraries from 9.0.0 to 9.0.2.
• A Redis error is considered fatal and all running scans are stopped. A
  message is sent to the client and the NVTs are reloaded.
• A new progress bar style in which dead host are not taken in account was
  added, which makes more time realistic the progress bar.
• An issue which caused low scan performance has been addressed.
• The preference log_whole_attack is now an scanner-only preference.
• Several memory management issues have been addressed.
• Load-up plugins process is now a forked child process, which prevent main
  process memory footprint growth.
• Plugin preferences are sent directly to the client.
• Full nvticache has been moved from .nvti files to Redis.
• An issue with dependency cycle detection has been addressed.
• An issue which cause complete deletion of nvticache before reloading has
  been addressed.