rtnetlink.7: Line in table too long

Fix warning from "man ..." ("nroff -ww ..."):

    nroff: rtnetlink.7: warning: around line 415:
    table wider than line width

Column gutter reduced to fit line length.
Right adjustment in text blocks removed in tables.
Some header made centered in tables.
One table put on same page.

See http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=674051

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man7/rtnetlink.7

@@ -81,9 +81,10 @@ contains the device flags, see
 is the unique interface index,
 .I ifi_change
 is reserved for future use and should be always set to 0xFFFFFFFF.
+.na
 .TS
 tab(:);
-c
+c s s
 l l l.
 Routing attributes
 rta_type:value type:description
@@ -99,6 +100,7 @@ IFLA_STATS:T{
 see below
 T}:Interface Statistics.
 .TE
+.ad
 .sp
 The value type for IFLA_STATS is \fIstruct net_device_stats\fP.
 .TP
@@ -145,7 +147,7 @@ for secondary address (old alias interface),
 for a permanent address set by the user and other undocumented flags.
 .TS
 tab(:);
-c
+c s s
 l l l.
 Attributes
 rta_type:value type:description
@@ -195,6 +197,7 @@ struct rtmsg {
     unsigned int  rtm_flags;
 };
 .fi
+.na
 .TS
 tab(:);
 l l.
@@ -219,6 +222,8 @@ RTN_XRESOLVE:T{
 refer to an external resolver (not implemented)
 T}
 .TE
+.ad
+.na
 .TS
 tab(:);
 l l.
@@ -232,6 +237,7 @@ RTPROT_KERNEL:by the kernel
 RTPROT_BOOT:during boot
 RTPROT_STATIC:by the administrator
 .TE
+.ad
 
 Values larger than
 .B RTPROT_STATIC
@@ -244,6 +250,7 @@ for the routing daemon identifiers which are already assigned.
 
 .I rtm_scope
 is the distance to the destination:
+.na
 .TS
 tab(:);
 l l.
@@ -255,6 +262,7 @@ RT_SCOPE_LINK:route on this link
 RT_SCOPE_HOST:route on the local host
 RT_SCOPE_NOWHERE:destination doesn't exist
 .TE
+.ad
 
 The values between
 .B RT_SCOPE_UNIVERSE
@@ -265,6 +273,7 @@ are available to the user.
 The
 .I rtm_flags
 have the following meanings:
+.na
 .TS
 tab(:);
 l l.
@@ -274,6 +283,7 @@ T}
 RTM_F_CLONED:route is cloned from another route
 RTM_F_EQUALIZE:a multipath equalizer (not yet implemented)
 .TE
+.ad
 
 .I rtm_table
 specifies the routing table
@@ -290,9 +300,11 @@ The user may assign arbitrary values between
 .B RT_TABLE_UNSPEC
 and
 .BR RT_TABLE_DEFAULT .
+.\" Keep table on same page
+.bp +1
 .TS
 tab(:);
-c
+c s s
 l l l.
 Attributes
 rta_type:value type:description
@@ -410,8 +422,8 @@ struct tcmsg {
 .fi
 .TS
 tab(:);
-c
-l l l.
+c s s
+l2 l2 l.
 Attributes
 rta_type:value type:Description
 _