Adding StrippingALP2TauTau to be ran ONLY in 2017

The physics case is motivated by this paper on a search for a light pseudoscalar (axion-like particle) at LHCb. The lines are present in other campaigns (S34r0p2, S28r2p1), but for some reason they are not for 2017.

The lines have a very tight selection so you do not expect to see many events in a 10k test, except from the \tau(\to{3\pi})\tau(\to{3\pi}), which is way looser. For the others (semileptonic, purely leptonic) Some will pop with a 100k test and/or during validation.

The multiplicities, slightly higher than 1, are expected since we are dealing with pions in the low-mass region. In any case, timings excluding the opening of the particle containers and other imports are perfectly fine since all are less than 0.1 ms/evt.

StrippingReport                                                INFO Event 10000, Good event 10000
 |                                              *Decision name*|*Rate,%*|*Accepted*| *Mult*|*ms/evt*|
 |_StrippingGlobal_                                            |  0.0800|         8|       | 108.850|
 |_StrippingSequenceStreamBhadronCompleteEvent_                |  0.0800|         8|       | 108.834|
 |!StrippingHTau3HTau3HLine                                    |  0.0300|         3|  1.333|  52.133|
 |!StrippingHTau3HTauMuLine                                    |  0.0000|         0|  0.000|   2.176|
 |!StrippingHTau3HTauELine                                     |  0.0000|         0|  0.000|   2.751|
 |!StrippingHTauMuTauELine                                     |  0.0000|         0|  0.000|   0.075|
 |!StrippingHTau3HTau3HDisplacedLine                           |  0.0500|         5|  1.200|  48.323|
 |!StrippingHTau3HTauMuDisplacedLine                           |  0.0000|         0|  0.000|   1.858|
 |!StrippingHTau3HTauEDisplacedLine                            |  0.0000|         0|  0.000|   0.474|
 |!StrippingHTauMuTauEDisplacedLine                            |  0.0000|         0|  0.000|   0.025|
 |!StrippingHTau3HTau3HLine_TIMING                             |  0.0300|         3|  1.333|   0.028|
 |!StrippingHTau3HTauMuLine_TIMING                             |  0.0000|         0|  0.000|   0.034|
 |!StrippingHTau3HTauELine_TIMING                              |  0.0000|         0|  0.000|   0.032|
 |!StrippingHTauMuTauELine_TIMING                              |  0.0000|         0|  0.000|   0.031|
 |!StrippingHTau3HTau3HDisplacedLine_TIMING                    |  0.0500|         5|  1.200|   0.035|
 |!StrippingHTau3HTauMuDisplacedLine_TIMING                    |  0.0000|         0|  0.000|   0.035|
 |!StrippingHTau3HTauEDisplacedLine_TIMING                     |  0.0000|         0|  0.000|   0.028|
 |!StrippingHTauMuTauEDisplacedLine_TIMING                     |  0.0000|         0|  0.000|   0.029|