FEATURE: Add Functions to so-nsm-clear to Remove Strelka and Import Data

[bryant-treacle]

Add the following functions to the so-nsm-clear script:

delete_import() {
IMPORT_DATA="/nsm/import/"
[ -d $IMPORT_DATA ] && rm -rf $IMPORT_DATA/*
}

delete_strelka() {
STRELKA_HISTORY_DATA="/nsm/strelka/history/"
STRELKA_PROCESSED_DATA="/nsm/strelka/processed/"
[ -d $STRELKA_HISTORY_DATA ] && rm -rf $STRELKA_HISTORY_DATA/*
[ -d $STRELKA_PROCESSED_DATA ] && rm -rf $STRELKA_PROCESSED_DATA/*
}