Merge pull request prometheus#435 from nikakis/introduce-support-for-…

…snmp

Introduce parsing for `/proc/<pid>/net/snmp`, `/proc/<pid>/net/snmp6` and `/proc/<pid>/net/netstat`.

fixtures.ttar

@@ -156,6 +156,125 @@ Inter-|   Receive                                                |  Transmit
   eth0:     438       5    0    0    0     0          0         0      648       8    0    0    0     0       0          0
 Mode: 644
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: fixtures/proc/26231/net/snmp
+Lines: 12
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+IcmpMsg: 45 50
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+UdpLite: InDatagrams NoPorts InErrors OutDatagrams RcvbufErrors SndbufErrors InCsumErrors IgnoredMulti
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+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: fixtures/proc/26231/net/netstat
+Lines: 4
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+Mode: 644
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: fixtures/proc/26231/net/snmp6
+Lines: 92
+Ip6InReceives                   	92166
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+Ip6InTooBigErrors               	0
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+Mode: 644
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Directory: fixtures/proc/26231/ns
 Mode: 755
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -