[#76] Add UNIQUE keyword

Signed-off-by: Alejandro Lopez <a.lopez@yadro.com>

netmap/parser/QueryLexer.tokens

@@ -2,38 +2,40 @@ NOT_OP=1
 AND_OP=2
 OR_OP=3
 SIMPLE_OP=4
-REP=5
-IN=6
-AS=7
-CBF=8
-SELECT=9
-FROM=10
-FILTER=11
-WILDCARD=12
-CLAUSE_SAME=13
-CLAUSE_DISTINCT=14
-L_PAREN=15
-R_PAREN=16
-AT=17
-IDENT=18
-NUMBER1=19
-ZERO=20
-STRING=21
-WS=22
+UNIQUE=5
+REP=6
+IN=7
+AS=8
+CBF=9
+SELECT=10
+FROM=11
+FILTER=12
+WILDCARD=13
+CLAUSE_SAME=14
+CLAUSE_DISTINCT=15
+L_PAREN=16
+R_PAREN=17
+AT=18
+IDENT=19
+NUMBER1=20
+ZERO=21
+STRING=22
+WS=23
 'NOT'=1
 'AND'=2
 'OR'=3
-'REP'=5
-'IN'=6
-'AS'=7
-'CBF'=8
-'SELECT'=9
-'FROM'=10
-'FILTER'=11
-'*'=12
-'SAME'=13
-'DISTINCT'=14
-'('=15
-')'=16
-'@'=17
-'0'=20
+'UNIQUE'=5
+'REP'=6
+'IN'=7
+'AS'=8
+'CBF'=9
+'SELECT'=10
+'FROM'=11
+'FILTER'=12
+'*'=13
+'SAME'=14
+'DISTINCT'=15
+'('=16
+')'=17
+'@'=18
+'0'=21