Drop use of 'allow_abbrev' as its python 3.5 or later only

Use of this argparse constructor keyword is causing regression
test failures, and its use was nice-to-have - this means the -e
shorthand for --ebpf will be available iff its not been used in
another add_argument call.  Neither -e/--ebpf are advertised in
the usage message anyway.

tools/biolatency.py

@@ -27,7 +27,7 @@ examples = """examples:
 parser = argparse.ArgumentParser(
     description="Summarize block device I/O latency as a histogram",
     formatter_class=argparse.RawDescriptionHelpFormatter,
-    epilog=examples, allow_abbrev=False)
+    epilog=examples)
 parser.add_argument("-T", "--timestamp", action="store_true",
     help="include timestamp on output")
 parser.add_argument("-Q", "--queued", action="store_true",

tools/biotop.py

@@ -31,7 +31,7 @@ examples = """examples:
 parser = argparse.ArgumentParser(
     description="Block device (disk) I/O by process",
     formatter_class=argparse.RawDescriptionHelpFormatter,
-    epilog=examples, allow_abbrev=False)
+    epilog=examples)
 parser.add_argument("-C", "--noclear", action="store_true",
     help="don't clear the screen")
 parser.add_argument("-r", "--maxrows", default=20,

tools/tcplife.py

@@ -43,7 +43,7 @@ examples = """examples:
 parser = argparse.ArgumentParser(
     description="Trace the lifespan of TCP sessions and summarize",
     formatter_class=argparse.RawDescriptionHelpFormatter,
-    epilog=examples, allow_abbrev=False)
+    epilog=examples)
 parser.add_argument("-T", "--time", action="store_true",
     help="include time column on output (HH:MM:SS)")
 parser.add_argument("-t", "--timestamp", action="store_true",