T7073: Verify VPP buffers page size

[HollyGurza]

T7077: Verify VPP memory default-hugepage-size
T7079: Verify VPP memory main-heap-page-size
T7080: Verify VPP statseg page-size

get available hugepage sizes
align memory main-heap-size by page size
validate host_resources max_map_count

Change Summary

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Other (please describe):

Related Task(s)

• https://vyos.dev/T7073
• https://vyos.dev/T7077
• https://vyos.dev/T7079
• https://vyos.dev/T7080

Related PR(s)

Proposed changes

vyos@vyos# set vpp settings buffers page-size 
Possible completions:
   default              Default
   default-hugepage     Default huge-page
   2048K                
   2M                   
   4K                   

vyos@vyos# set vpp settings statseg page-size 
Possible completions:
   default              Default
   default-hugepage     Default huge-page
   2048K                
   2M                   
   4K           
   
vyos@vyos# set vpp settings memory main-heap-page-size 
Possible completions:
   default              Default
   default-hugepage     Default huge-page
   2048K                
   2M                   
   4K                   

vyos@vyos# set vpp settings memory default-hugepage-size 
Possible completions:
   <text>               Default hugepage size
   2048K                
   2M                   

How to test

test_13_mem_page_size (__main__.TestVPP.test_13_mem_page_size) ... ok
test_14_mem_default_hugepage (__main__.TestVPP.test_14_mem_default_hugepage) ... ok

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly