ocf:pacemaker:SysInfo shows incorrect value of ram_free for centos 5

On Investigating the code we see that the the value shown to be ram_free is the following
`mem=``grep "Inactive" /proc/meminfo | awk '{print $2"k"}'``
mem_total=``grep "MemTotal" /proc/meminfo | awk '{print $2"k"}'``
`

As per centos 5 documentation https://www.centos.org/docs/5/html/5.2/Deployment_Guide/s2-proc-meminfo.html
The attribute _Inactive_ means the following

> Inactive — The total amount of buffer or page cache memory, in kilobytes, that are free and available. This is memory that has not been recently used and can be reclaimed for other purposes.

The actual value that the resource should be showing corresponds to

> MemFree — The amount of physical RAM, in kilobytes, left unused by the system.

Locate the ocf:pacemaker:SysInfo implementation that computes ram_free and inspect the commands shown in the issue. Compare the Inactive and MemFree fields in /proc/meminfo using the linked CentOS documentation; done when ram_free reports the intended MemFree value.

Written by the indexing model from the issue text.