Changes on stripping line B2KstTauE

Modifications on the stripping lines StrippingB2KstTauTau_TauE_Line and StrippingB2KstTauTau_TauE_SameSign_Line for selecting B -> K* tau e OS and SS candidates for 2016, 2017, 2018 data.

• Loosing requirement on electron momentum;
• Remove SS prescale;
• Change PID cut on electron;
• Add electron cone and vertex isolation information;
• Add kinematic requirements on B candidate to reduce rates;
• Add HLT filter to reduce rates;

Following results are based on 100k events.

• 2016 SAMPLE

Line	Rate (%)	Timing (ms/evt)
StrippingB2KstTauTau_TauE_Line	0.0440	0.046
StrippingB2KstTauTau_TauE_SameSign_Line	0.0240	0.039

• 2017 SAMPLE

Line	Rate (%)	Timing (ms/evt)
StrippingB2KstTauTau_TauE_Line	0.0610	0.052
StrippingB2KstTauTau_TauE_SameSign_Line	0.040	0.047

• 2018 SAMPLE

Line	Rate (%)	Timing (ms/evt)
StrippingB2KstTauTau_TauE_Line	0.0560	0.059
StrippingB2KstTauTau_TauE_SameSign_Line	0.0530	0.049

TODO:

• Fix high rates

cc: @fpolci, @vincentp