LU-8703 libcfs: make tolerant to offline CPUs and empty NUMA nodes

LU-8703 libcfs: make tolerant to offline CPUs and empty NUMA nodes

Rework CPU partition code in the way of make it more tolerant to
offline CPUs and empty nodes.

For example, in KNL:
available: 8 nodes (0-7)
node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221
node 0 size: 24472 MB
node 0 free: 12409 MB
node 1 cpus: 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239
node 1 size: 24576 MB
node 1 free: 20388 MB
node 2 cpus: 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255
node 2 size: 24576 MB
node 2 free: 20621 MB
node 3 cpus: 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271
node 3 size: 24576 MB
node 3 free: 21183 MB
node 4 cpus:
node 4 size: 4096 MB
node 4 free: 3982 MB
node 5 cpus:
node 5 size: 4096 MB
node 5 free: 3982 MB
node 6 cpus:
node 6 size: 4096 MB
node 6 free: 3982 MB
node 7 cpus:
node 7 size: 4096 MB
node 7 free: 3981 MB
node distances:
node   0   1   2   3   4   5   6   7
  0:  10  21  21  21  31  41  41  41
  1:  21  10  21  21  41  31  41  41
  2:  21  21  10  21  41  41  31  41
  3:  21  21  21  10  41  41  41  31
  4:  31  41  41  41  10  41  41  41
  5:  41  31  41  41  41  10  41  41
  6:  41  41  31  41  41  41  10  41
  7:  41  41  41  31  41  41  41  10

Contain the fix for LU-8492 ptlrpc: Correctly calculate hrp->hrp_nthrs
Fix an error code return which was introduced in
commit def25e9c7eff57cdaf8a6ee5e8e7db005bab6525

Change-Id: I7f64a20ee009a88e836f592ce044400f07ffbcdd
Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-on: https://review.whamcloud.com/23222
Reviewed-by: Amir Shehata <amir.shehata@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>