Remove requirement that suite files begin with "suite_"

[mkavulich]

Description

As part of a new set of suite naming guidelines (see NCAR/ccpp-doc#72), we are removing the requirement that suite definition file names begin with the literal string suite_. SDF filenames will still need to match the suite name, but without the suite_ prefix. Currently this requirement is hard-coded into CCPP prebuild (but not in capgen).

Solution

The logic that checks for suite definition files in prebuild needs to be updated to remove the suite_ prefix requirement. This check occurs in a few different places so this will be a bit more than a one-line change, especially due to extra logic to maintain back-compatibility with the old naming style.

[climbfuji]

Closed via #569