fix(AdminController): Allow setting nice value #32

Job	Run time
Test files:scan command on sqlite-stable27	8m 39s
Test files:scan command on sqlite-v27.0.0	10m 58s
Test files:scan command on sqlite-v27.0.1	6m 40s
Test files:scan command on sqlite-v27.0.2	6m 42s
Test files:scan command on mysql-stable27	16m 34s
Test files:scan command on mysql-v27.0.0	9m 41s
Test files:scan command on mysql-v27.0.1	10m 24s
Test files:scan command on mysql-v27.0.2	17m 34s
Test files:scan command on pgsql-stable27	15m 55s
Test files:scan command on pgsql-v27.0.0	8m 15s
Test files:scan command on pgsql-v27.0.1	7m 17s
Test files:scan command on pgsql-v27.0.2	16m 8s
	2h 14m 47s

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