windows ansible_memtotal_mb reports 1mb less

[gstorme]

SUMMARY

The Powershell command behind the ansible_memtotal_mb uses a math round of the TotalPhysicalMemory, but it's always rounding the value down.
Because of this, a server with 2GB for example reports 2047MB memotal_mb.

I'll create a PR to replace the math round with ceiling, so the reported MB matches the actual installed RAM in GB.

ISSUE TYPE

• Bug Report

COMPONENT NAME

./lib/ansible/modules/windows/setup.ps1

ANSIBLE VERSION

ansible 2.7.0
  config file = /etc/ansible/ansible.cfg
  configured module search path = [u'/root/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/dist-packages/ansible
  executable location = /usr/bin/ansible
  python version = 2.7.13 (default, Nov 24 2017, 17:33:09) [GCC 6.3.0 20170516]

OS / ENVIRONMENT

Tested on Windows Server 2012R2 and Windows Server 2016

STEPS TO REPRODUCE

---
- hosts:
  - test004
  tasks:
  - debug:
      msg: "{{ ansible_memtotal_mb }}"

EXPECTED RESULTS

For a server with 1GB RAM, 1024 MB
For a server with 2GB RAM, 2048 MB
...

ACTUAL RESULTS

1GB -> 1023MB
2GB -> 2047MB
...

[ansibot]

Files identified in the description:

• lib/ansible/modules/windows/setup.ps1

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[ansibot]

@gstorme: Greetings! Thanks for taking the time to open this issue. In order for the community to handle your issue effectively, we need a bit more information.

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• ansible version

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[ansibot]

cc @dagwieers @jborean93 @jhawkesworth @nitzmahone
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