[Crash-utility] New option -g with sig

Hello Dave, This patch try to apply your new function show_tgid_list() in the signal context. The signal part at the task group level is first shown, then we show the relevant part for each task in the task group. When it will be OK for you, i'll update the help file. crash> sig -g 27491 SIGNAL_STRUCT: f78f8380 COUNT: 3 SIG SIGACTION HANDLER MASK FLAGS [1] c1f3f104 SIG_DFL 0000000000000000 0 [2] c1f3f118 SIG_DFL 0000000000000000 0 [3] c1f3f12c SIG_DFL 0000000000000000 0 [4] c1f3f140 SIG_DFL 0000000000000000 0 [5] c1f3f154 SIG_DFL 0000000000000000 0 [6] c1f3f168 SIG_DFL 0000000000000000 0 [7] c1f3f17c SIG_DFL 0000000000000000 0 [8] c1f3f190 SIG_DFL 0000000000000000 0 [9] c1f3f1a4 SIG_DFL 0000000000000000 0 [10] c1f3f1b8 804877e 0000000000000000 4 (SA_SIGINFO) [11] c1f3f1cc SIG_DFL 0000000000000000 0 ... [62] c1f3f5c8 SIG_DFL 0000000000000000 0 [63] c1f3f5dc SIG_DFL 0000000000000000 0 [64] c1f3f5f0 SIG_DFL 0000000000000000 0 SHARED_PENDING SIGNAL: 0000000200000200 SIGQUEUE: SIG SIGINFO 10 f56f3c84 34 f56f390c 34 f56f3878 34 f56f37e4 34 f56f3060 PID: 27489 TASK: f606b560 CPU: 0 COMMAND: "sig_procthread" SIGPENDING: no BLOCKED: 0000080200000a00 PRIVATE_PENDING SIGNAL: 0000080000000800 SIGQUEUE: SIG SIGINFO 12 f56f3f68 44 f56f3ed4 44 f56f3e40 44 f56f3dac 44 f56f3d18 PID: 27490 TASK: f7d09020 CPU: 0 COMMAND: "sig_procthread" SIGPENDING: no BLOCKED: 0000000200000200 PRIVATE_PENDING SIGNAL: 0000000000000000 SIGQUEUE: (empty) PID: 27491 TASK: f544f020 CPU: 1 COMMAND: "sig_procthread" SIGPENDING: no BLOCKED: 0000000200000200 PRIVATE_PENDING SIGNAL: 0000000000000000 SIGQUEUE: (empty)