Ignore auto-generated plugin files from the license check.
Ignore auto-generated plugin files from the license check.

Summary:
When doing plugin development, parsing files are autogenerated
in src/com/facebook/buck/intellij/plugin/gen.  These files
should be exempt from the license check.

Test Plan:
Run scripts/generate_grammar_kit.py to generate files in
src/com/facebook/buck/intellij/plugin/gen.  Check that
src/com/facebook/buck/intellij/plugin/gen/com/facebook/buck/intellij/plugin/lang/BuckParser.java
exists (and, obviously, does not have a license).  Run
"ant test" to verify that this does not cause the
LicenseCheckTest to fail.

Reviewed By: yiding

fbshipit-source-id: 755ec23

JoelMarcey/buck,daedric/buck,illicitonion/buck,robbertvanginkel/buck,JoelMarcey/buck,OkBuilds/buck,justinmuller/buck,zpao/buck,kageiit/buck,darkforestzero/buck,illicitonion/buck,rmaz/buck,illicitonion/buck,shybovycha/buck,darkforestzero/buck,grumpyjames/buck,shs96c/buck,ilya-klyuchnikov/buck,romanoid/buck,romanoid/buck,k21/buck,shs96c/buck,shybovycha/buck,davido/buck,grumpyjames/buck,grumpyjames/buck,zhan-xiong/buck,illicitonion/buck,janicduplessis/buck,daedric/buck,romanoid/buck,raviagarwal7/buck,rmaz/buck,LegNeato/buck,grumpyjames/buck,justinmuller/buck,zhan-xiong/buck,SeleniumHQ/buck,davido/buck,illicitonion/buck,k21/buck,justinmuller/buck,k21/buck,k21/buck,SeleniumHQ/buck,shybovycha/buck,vschs007/buck,kageiit/buck,LegNeato/buck,raviagarwal7/buck,darkforestzero/buck,davido/buck,vschs007/buck,marcinkwiatkowski/buck,davido/buck,facebook/buck,raviagarwal7/buck,JoelMarcey/buck,marcinkwiatkowski/buck,romanoid/buck,romanoid/buck,ilya-klyuchnikov/buck,shs96c/buck,grumpyjames/buck,shybovycha/buck,nguyentruongtho/buck,janicduplessis/buck,Addepar/buck,clonetwin26/buck,vschs007/buck,clonetwin26/buck,rmaz/buck,facebook/buck,JoelMarcey/buck,grumpyjames/buck,davido/buck,vschs007/buck,janicduplessis/buck,janicduplessis/buck,zhan-xiong/buck,rmaz/buck,shs96c/buck,janicduplessis/buck,darkforestzero/buck,SeleniumHQ/buck,sdwilsh/buck,rmaz/buck,zhan-xiong/buck,clonetwin26/buck,OkBuilds/buck,robbertvanginkel/buck,dsyang/buck,darkforestzero/buck,robbertvanginkel/buck,Addepar/buck,nguyentruongtho/buck,k21/buck,brettwooldridge/buck,justinmuller/buck,ilya-klyuchnikov/buck,dsyang/buck,shybovycha/buck,romanoid/buck,LegNeato/buck,clonetwin26/buck,clonetwin26/buck,dsyang/buck,raviagarwal7/buck,Addepar/buck,robbertvanginkel/buck,vschs007/buck,SeleniumHQ/buck,JoelMarcey/buck,Addepar/buck,zhan-xiong/buck,nguyentruongtho/buck,zhan-xiong/buck,sdwilsh/buck,OkBuilds/buck,brettwooldridge/buck,daedric/buck,rmaz/buck,ilya-klyuchnikov/buck,SeleniumHQ/buck,grumpyjames/buck,marcinkwiatkowski/buck,robbertvanginkel/buck,romanoid/buck,raviagarwal7/buck,darkforestzero/buck,raviagarwal7/buck,robbertvanginkel/buck,nguyentruongtho/buck,clonetwin26/buck,clonetwin26/buck,SeleniumHQ/buck,dsyang/buck,illicitonion/buck,brettwooldridge/buck,kageiit/buck,dsyang/buck,facebook/buck,ilya-klyuchnikov/buck,illicitonion/buck,facebook/buck,shs96c/buck,k21/buck,vschs007/buck,robbertvanginkel/buck,marcinkwiatkowski/buck,zpao/buck,OkBuilds/buck,kageiit/buck,ilya-klyuchnikov/buck,ilya-klyuchnikov/buck,darkforestzero/buck,brettwooldridge/buck,daedric/buck,brettwooldridge/buck,k21/buck,LegNeato/buck,marcinkwiatkowski/buck,OkBuilds/buck,darkforestzero/buck,shybovycha/buck,JoelMarcey/buck,dsyang/buck,vschs007/buck,k21/buck,romanoid/buck,LegNeato/buck,rmaz/buck,illicitonion/buck,clonetwin26/buck,daedric/buck,Addepar/buck,k21/buck,k21/buck,daedric/buck,ilya-klyuchnikov/buck,sdwilsh/buck,zpao/buck,kageiit/buck,nguyentruongtho/buck,zhan-xiong/buck,marcinkwiatkowski/buck,daedric/buck,romanoid/buck,LegNeato/buck,romanoid/buck,JoelMarcey/buck,justinmuller/buck,sdwilsh/buck,zpao/buck,marcinkwiatkowski/buck,darkforestzero/buck,JoelMarcey/buck,robbertvanginkel/buck,raviagarwal7/buck,OkBuilds/buck,nguyentruongtho/buck,OkBuilds/buck,zhan-xiong/buck,SeleniumHQ/buck,zhan-xiong/buck,facebook/buck,vschs007/buck,janicduplessis/buck,daedric/buck,brettwooldridge/buck,marcinkwiatkowski/buck,grumpyjames/buck,vschs007/buck,LegNeato/buck,shs96c/buck,shs96c/buck,marcinkwiatkowski/buck,ilya-klyuchnikov/buck,Addepar/buck,davido/buck,OkBuilds/buck,zpao/buck,shybovycha/buck,LegNeato/buck,janicduplessis/buck,shs96c/buck,illicitonion/buck,brettwooldridge/buck,daedric/buck,SeleniumHQ/buck,sdwilsh/buck,justinmuller/buck,JoelMarcey/buck,dsyang/buck,illicitonion/buck,darkforestzero/buck,janicduplessis/buck,SeleniumHQ/buck,raviagarwal7/buck,illicitonion/buck,justinmuller/buck,shybovycha/buck,vschs007/buck,marcinkwiatkowski/buck,zhan-xiong/buck,davido/buck,illicitonion/buck,sdwilsh/buck,sdwilsh/buck,sdwilsh/buck,zpao/buck,daedric/buck,LegNeato/buck,ilya-klyuchnikov/buck,k21/buck,JoelMarcey/buck,vschs007/buck,grumpyjames/buck,justinmuller/buck,brettwooldridge/buck,brettwooldridge/buck,ilya-klyuchnikov/buck,sdwilsh/buck,shs96c/buck,OkBuilds/buck,JoelMarcey/buck,davido/buck,janicduplessis/buck,Addepar/buck,justinmuller/buck,LegNeato/buck,darkforestzero/buck,sdwilsh/buck,daedric/buck,justinmuller/buck,justinmuller/buck,justinmuller/buck,davido/buck,rmaz/buck,dsyang/buck,JoelMarcey/buck,rmaz/buck,dsyang/buck,robbertvanginkel/buck,Addepar/buck,darkforestzero/buck,illicitonion/buck,Addepar/buck,OkBuilds/buck,facebook/buck,shs96c/buck,rmaz/buck,zhan-xiong/buck,clonetwin26/buck,davido/buck,shybovycha/buck,rmaz/buck,OkBuilds/buck,facebook/buck,OkBuilds/buck,janicduplessis/buck,shs96c/buck,darkforestzero/buck,vschs007/buck,shs96c/buck,ilya-klyuchnikov/buck,daedric/buck,grumpyjames/buck,shybovycha/buck,dsyang/buck,LegNeato/buck,rmaz/buck,nguyentruongtho/buck,dsyang/buck,LegNeato/buck,shs96c/buck,marcinkwiatkowski/buck,shybovycha/buck,brettwooldridge/buck,SeleniumHQ/buck,k21/buck,Addepar/buck,OkBuilds/buck,robbertvanginkel/buck,dsyang/buck,janicduplessis/buck,raviagarwal7/buck,marcinkwiatkowski/buck,grumpyjames/buck,raviagarwal7/buck,SeleniumHQ/buck,clonetwin26/buck,marcinkwiatkowski/buck,ilya-klyuchnikov/buck,raviagarwal7/buck,romanoid/buck,shybovycha/buck,sdwilsh/buck,janicduplessis/buck,rmaz/buck,grumpyjames/buck,brettwooldridge/buck,zpao/buck,robbertvanginkel/buck,romanoid/buck,Addepar/buck,daedric/buck,robbertvanginkel/buck,clonetwin26/buck,justinmuller/buck,brettwooldridge/buck,vschs007/buck,Addepar/buck,sdwilsh/buck,davido/buck,clonetwin26/buck,raviagarwal7/buck,kageiit/buck,romanoid/buck,davido/buck,SeleniumHQ/buck,robbertvanginkel/buck,JoelMarcey/buck,Addepar/buck,SeleniumHQ/buck,davido/buck,clonetwin26/buck,k21/buck,brettwooldridge/buck,LegNeato/buck,zhan-xiong/buck,zhan-xiong/buck,shybovycha/buck,raviagarwal7/buck,kageiit/buck,sdwilsh/buck,dsyang/buck