Support for re-run of REQs

[The-Mule]

Right now there is an option to rerun REQs based on their result (e.g. all that failed). It would be very practical to be able to specify exactly which REQs to run, e.g.:

newa execute --restart-reqs  REQ-1.2.3, REQ-4.5.6

[kkaarreell]

This is being worked on in #154.
ATM, one cannot use the short for --restart-req REQ-1.2.1,REQ-2.2.2, however you could use regexp.
Providing multiple values with just one switch is not yet currently supported. We could use that also for other newa options but better to do it in a separate request (or commit).

[kkaarreell]

@The-Mule could you please test it?

[The-Mule]

Tested both long and short variants using it both once and twice (to restart two reqs at the same time), it works. The very last version dropped support of regular expression but I think it is not really needed since you can use -R multiple times and the structure of REQ ids does not really make much difference from that and RE. Thank you for this functionality.

It is super useful, especially when paired with recipe having a single dimension matrix for each ("leaf") plan (resulting of one REQ per plan and architecture).