[Snyk] Security upgrade centos from 7.4.1708 to 7

[snyk-bot]

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• build/disk/Dockerfile

We recommend upgrading to centos:7, as this image has only 981 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	686	Heap-based Buffer Overflow SNYK-CENTOS7-GLIBC-2099455	Mature
	714	Buffer Overflow SNYK-CENTOS7-NSS-2308137	No Known Exploit
	714	Buffer Overflow SNYK-CENTOS7-NSSSYSINIT-2308141	No Known Exploit
	714	Buffer Overflow SNYK-CENTOS7-NSSTOOLS-2308139	No Known Exploit
	686	Use of a Broken or Risky Cryptographic Algorithm SNYK-CENTOS7-PYTHON-2103607	Mature

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🦉 Use of a Broken or Risky Cryptographic Algorithm