[ENHANCEMENT] Make mem and cpu dynamic

[DonRichards]

GitHub Issue: Islandora/documentation#1413

What does this Pull Request do?

1. Assess how much ram is available.
2. If "ISLANDORA_VAGRANT_MEMORY" is set use it. Otherwise If "ISLANDORA_VAGRANT_MEMORY" is blank use whichever is larger, 1/2 the RAM or 4GB.
3. If "ISLANDORA_VAGRANT_CPUS" is set use it. Otherwise if "ISLANDORA_VAGRANT_CPUS" is blank and there are no other VMS running set the CPU to 1/2 of the available CPUs, otherwise default to 1 core.

What's new?

It looks up if VMS are running so that it doesn't over allocate the VM resources.

How should this be tested?

• Test on a MAC, Linux, and windows machine to verify the test commands don't fail on a specific OS.
• Test if the 2 variable overrides work "ISLANDORA_VAGRANT_MEMORY" & "ISLANDORA_VAGRANT_CPUS"
• Test that the defaults are triggered when different VM is already running. This avoids issues will allocating too much RAM/CPUs collectively. It was brought up on the CLAW call as a check that would be useful.

# How many Cores
$ lscpu

# How much memory
$ free -h | gawk  '/Mem:/{print $2}'

Additional Notes:

N/A

Interested parties

@Islandora-Devops/committers

[DonRichards]

The CPU detect is off. Working on it.

[DonRichards]

Ready for testing. @dannylamb @Islandora-Devops/committers

[DonRichards]

From the host machine I ran this. Not sure what to suggest for linux or windows to make the comparison but it should be easy enough.

$ sysctl hw.ncpu
hw.ncpu: 8

$ system_profiler SPHardwareDataType | grep "  Memory:"
Memory: 64 GB

[DonRichards]

@Islandora-Devops/committers Is there any interest in having this merged?