db*: Print the BPF program prior to loading it (in -v mode)

Printing the BPF program after loading it means that if there is a
load error, the program isn't printed, which sort of defeats the
purpose of the whole thing.

tools/dbslower.py

@@ -106,11 +106,12 @@
  usdt.enable_probe("query__start", "probe_start")
  usdt.enable_probe("query__done", "probe_end")
 
-bpf = BPF(text=program, usdt_contexts=usdts)
 if args.verbose:
  print('\n'.join(map(lambda u: u.get_text(), usdts)))
  print(program)
 
+bpf = BPF(text=program, usdt_contexts=usdts)
+
 class Data(ct.Structure):
  _fields_ = [
  ("pid", ct.c_ulonglong),

tools/dbstat.py

@@ -88,11 +88,12 @@
  usdt.enable_probe("query__start", "probe_start")
  usdt.enable_probe("query__done", "probe_end")
 
-bpf = BPF(text=program, usdt_contexts=usdts)
 if args.verbose:
  print('\n'.join(map(lambda u: u.get_text(), usdts)))
  print(program)
 
+bpf = BPF(text=program, usdt_contexts=usdts)
+
 print("Tracing database queries for pids %s slower than %d ms..." %
  (', '.join(map(str, args.pids)), args.threshold))