executor: drop CAP_SYS_NICE

A process with CAP_SYS_NICE can bring kernel down by asking for too high SCHED_DEADLINE priority,
as the result rcu and other system services that use kernel threads will stop functioning.
Some parameters for SCHED_DEADLINE should be OK, but we don't have means to enforce
values of indirect syscall arguments. Peter Zijlstra proposed sysctl_deadline_period_{min,max}
which could be used to enfore safe limits without droppping CAP_SYS_NICE, but we don't have it yet.
See the following bug for details:
https://groups.google.com/forum/#!topic/syzkaller-bugs/G6Wl_PKPIWI

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