zowex: Running zowex ds list recalls/restores the data set

[zFernand0]

Describe the bug

When listing migrated/archived datasets, the zowex backend automatically restores/recalls them. Nice that they are restored automatically, but performance suffers on a simple DS list (from VSCE).

Expected and actual results

Expected to just view the list of datasets that matched the pattern without further action happening

bash-4.3$ zowex ds list fernando.lib.cntl1
FERNANDO.LIB.CNTL1                            MIGRAT PO
bash-4.3$ zowex ds list fernando.lib.cntl1
FERNANDO.LIB.CNTL1                            TSU132 PO

Describe your environment

Any environment really 😋

Additional context

Found this while testing restore from the VSCE (#126) 😋
Function to look into:

zowe-native-proto/native/c/zds.cpp

Line 423 in a454ff9

int zds_list_data_sets(ZDS *zds, string dsn, vector<ZDSEntry> &attributes)

[dkelosky]

dang... I didn't consider that during the implementation, but we effectively open each file in the list to obtain attributes. Besides performance, it's probably not desired to automatically restore data sets you don't intend to.