Description of problem:
While creating a docker container from satellite and allocating memory to the container w/o unit(i.e m for mb,g for gb) satellite UI throws error:
"Oops, we're sorry but something went wrong undefined method `full_messages' for #<Array:0x007f5175822990>"
Some helpfull message should be raised to mention unit or by default memory size should be considered in mb.

Version-Release number of selected component (if applicable):
Sat 6.2 Snap 9.2

How reproducible:


Steps to Reproduce:
1. From UI, Attempt to create a docker container with custom Memory size without unit.
2. Attempt to submit the Container.

Actual results:
satellite UI throws error:
"Oops, we're sorry but something went wrong undefined method `full_messages' for #<Array:0x007f5175822990>"

Expected results:
Some helpfull message should be raised to mention unit or by default memory size should be considered in mb.